Merge changes from topic "dec5" into main

* changes:
  Support more utils under Ravenwood.
  Trivial test package refactoring.
  Support more internal utils under Ravenwood.

159 files changed, 1585 insertions, 369 deletions

diff --git a/core/java/android/util/DayOfMonthCursor.java b/core/java/android/util/DayOfMonthCursor.java
index 393b98e324d3..ac5dc3a169c8 100644
--- a/core/java/android/util/DayOfMonthCursor.java
+++ b/core/java/android/util/DayOfMonthCursor.java
@@ -32,6 +32,7 @@ package android.util;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class DayOfMonthCursor extends MonthDisplayHelper {
 
     private int mRow;
diff --git a/core/java/android/util/DumpableContainer.java b/core/java/android/util/DumpableContainer.java
index fef5acd42e4e..24640c974500 100644
--- a/core/java/android/util/DumpableContainer.java
+++ b/core/java/android/util/DumpableContainer.java
@@ -20,6 +20,7 @@ import android.annotation.NonNull;
 /**
  * Represents a container that manages {@link Dumpable dumpables}.
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public interface DumpableContainer {
 
     /**
diff --git a/core/java/android/util/KeyValueListParser.java b/core/java/android/util/KeyValueListParser.java
index fbc66e6bda2a..783b2d63bcf3 100644
--- a/core/java/android/util/KeyValueListParser.java
+++ b/core/java/android/util/KeyValueListParser.java
@@ -28,6 +28,7 @@ import java.time.format.DateTimeParseException;
  * can be used.
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class KeyValueListParser {
     private final ArrayMap<String, String> mValues = new ArrayMap<>();
     private final TextUtils.StringSplitter mSplitter;
diff --git a/core/java/android/util/LongArrayQueue.java b/core/java/android/util/LongArrayQueue.java
index 354f8df0a43d..b9752fe4d1cc 100644
--- a/core/java/android/util/LongArrayQueue.java
+++ b/core/java/android/util/LongArrayQueue.java
@@ -28,6 +28,7 @@ import java.util.NoSuchElementException;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class LongArrayQueue {
 
     private long[] mValues;
diff --git a/core/java/android/util/LongSparseLongArray.java b/core/java/android/util/LongSparseLongArray.java
index d4a012602f80..86268facbec0 100644
--- a/core/java/android/util/LongSparseLongArray.java
+++ b/core/java/android/util/LongSparseLongArray.java
@@ -46,6 +46,7 @@ import com.android.internal.util.Preconditions;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class LongSparseLongArray implements Cloneable {
     @UnsupportedAppUsage(maxTargetSdk = 28) // The type isn't even public.
     private long[] mKeys;
diff --git a/core/java/android/util/MonthDisplayHelper.java b/core/java/android/util/MonthDisplayHelper.java
index c3f13fc2176b..3bd292b4ba49 100644
--- a/core/java/android/util/MonthDisplayHelper.java
+++ b/core/java/android/util/MonthDisplayHelper.java
@@ -24,6 +24,7 @@ import java.util.Calendar;
  *
  * Not thread safe.
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class MonthDisplayHelper {
 
     // display pref
diff --git a/core/java/android/util/RecurrenceRule.java b/core/java/android/util/RecurrenceRule.java
index 39d1f2cbef19..dc470d7edc53 100644
--- a/core/java/android/util/RecurrenceRule.java
+++ b/core/java/android/util/RecurrenceRule.java
@@ -42,6 +42,7 @@ import java.util.Objects;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class RecurrenceRule implements Parcelable {
     private static final String TAG = "RecurrenceRule";
     private static final boolean LOGD = Log.isLoggable(TAG, Log.DEBUG);
diff --git a/core/java/android/util/RotationUtils.java b/core/java/android/util/RotationUtils.java
index f20767b7485a..07ab996af12f 100644
--- a/core/java/android/util/RotationUtils.java
+++ b/core/java/android/util/RotationUtils.java
@@ -36,6 +36,7 @@ import android.view.SurfaceControl;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class RotationUtils {
 
     /**
diff --git a/core/java/android/util/SparseDoubleArray.java b/core/java/android/util/SparseDoubleArray.java
index 4b0cbe45d857..8a0b11e09d89 100644
--- a/core/java/android/util/SparseDoubleArray.java
+++ b/core/java/android/util/SparseDoubleArray.java
@@ -41,6 +41,7 @@ package android.util;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class SparseDoubleArray implements Cloneable {
     /**
      * The int->double map, but storing the doubles as longs using
diff --git a/core/java/android/util/SparseSetArray.java b/core/java/android/util/SparseSetArray.java
index 61f29a40ff50..80f6a4a0847f 100644
--- a/core/java/android/util/SparseSetArray.java
+++ b/core/java/android/util/SparseSetArray.java
@@ -22,6 +22,7 @@ import android.annotation.NonNull;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class SparseSetArray<T> {
     private final SparseArray<ArraySet<T>> mData;
 
diff --git a/core/java/android/util/StateSet.java b/core/java/android/util/StateSet.java
index 4bbc0f863603..16d6082649a7 100644
--- a/core/java/android/util/StateSet.java
+++ b/core/java/android/util/StateSet.java
@@ -34,7 +34,6 @@ import com.android.internal.R;
  * and not have static methods here but there is some concern about
  * performance since these methods are called during view drawing.
  */
-
 public class StateSet {
     /**
      * The order here is very important to
diff --git a/core/java/android/util/Xml.java b/core/java/android/util/Xml.java
index 2a33caaf7e28..ec6e90b4153e 100644
--- a/core/java/android/util/Xml.java
+++ b/core/java/android/util/Xml.java
@@ -334,6 +334,7 @@ public class Xml {
      *
      * @hide
      */
+    @android.ravenwood.annotation.RavenwoodKeep
     public static void copy(@NonNull XmlPullParser in, @NonNull XmlSerializer out)
             throws XmlPullParserException, IOException {
         // Some parsers may have already consumed the event that starts the
@@ -393,6 +394,7 @@ public class Xml {
      * unsupported, which can confuse serializers. This method normalizes empty
      * strings to be {@code null}.
      */
+    @android.ravenwood.annotation.RavenwoodKeep
     private static @Nullable String normalizeNamespace(@Nullable String namespace) {
         if (namespace == null || namespace.isEmpty()) {
             return null;
diff --git a/core/java/com/android/internal/os/SomeArgs.java b/core/java/com/android/internal/os/SomeArgs.java
index b12df6ed36ca..4701af3f2ddc 100644
--- a/core/java/com/android/internal/os/SomeArgs.java
+++ b/core/java/com/android/internal/os/SomeArgs.java
@@ -26,6 +26,7 @@ import android.os.Build;
  * it is responsibility of the client to recycle and instance
  * once it is no longer used.
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public final class SomeArgs {
 
     private static final int MAX_POOL_SIZE = 10;
diff --git a/core/java/com/android/internal/util/BitUtils.java b/core/java/com/android/internal/util/BitUtils.java
index 154ea52bf9ba..d928bbc3e9ad 100644
--- a/core/java/com/android/internal/util/BitUtils.java
+++ b/core/java/com/android/internal/util/BitUtils.java
@@ -31,6 +31,7 @@ import java.util.function.IntFunction;
  * sugar methods for {@link ByteBuffer}. Useful for networking and packet manipulations.
  * {@hide}
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public final class BitUtils {
     private BitUtils() {}
 
diff --git a/core/java/com/android/internal/util/BitwiseInputStream.java b/core/java/com/android/internal/util/BitwiseInputStream.java
index ffae3ce89ce4..91f89f39fc4d 100644
--- a/core/java/com/android/internal/util/BitwiseInputStream.java
+++ b/core/java/com/android/internal/util/BitwiseInputStream.java
@@ -26,6 +26,7 @@ import android.compat.annotation.UnsupportedAppUsage;
  *
  * NOTE -- This class is not threadsafe.
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class BitwiseInputStream {
 
     // The byte array being read from.
diff --git a/core/java/com/android/internal/util/BitwiseOutputStream.java b/core/java/com/android/internal/util/BitwiseOutputStream.java
index 9f4150860887..9b7568b54639 100644
--- a/core/java/com/android/internal/util/BitwiseOutputStream.java
+++ b/core/java/com/android/internal/util/BitwiseOutputStream.java
@@ -26,6 +26,7 @@ import android.compat.annotation.UnsupportedAppUsage;
  *
  * NOTE -- This class is not threadsafe.
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class BitwiseOutputStream {
 
     // The byte array being written to, which will be grown as needed.
diff --git a/core/java/com/android/internal/util/CallbackRegistry.java b/core/java/com/android/internal/util/CallbackRegistry.java
index 0f228d4775fd..0ae8e1d1e0c4 100644
--- a/core/java/com/android/internal/util/CallbackRegistry.java
+++ b/core/java/com/android/internal/util/CallbackRegistry.java
@@ -39,6 +39,7 @@ import java.util.List;
  * @param <T> The notification sender type. Typically this is the containing class.
  * @param <A> Opaque argument used to pass additional data beyond an int.
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class CallbackRegistry<C, T, A> implements Cloneable {
     private static final String TAG = "CallbackRegistry";
 
diff --git a/core/java/com/android/internal/util/DumpUtils.java b/core/java/com/android/internal/util/DumpUtils.java
index 8fe2b9cdf1e5..d1ff034ff001 100644
--- a/core/java/com/android/internal/util/DumpUtils.java
+++ b/core/java/com/android/internal/util/DumpUtils.java
@@ -37,6 +37,7 @@ import java.util.function.Predicate;
  * Test:
  atest FrameworksCoreTests:DumpUtilsTest
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public final class DumpUtils {
 
     /**
@@ -92,6 +93,8 @@ public final class DumpUtils {
      * @return true if access should be granted.
      * @hide
      */
+    @android.ravenwood.annotation.RavenwoodThrow(
+            blockedBy = android.permission.PermissionManager.class)
     public static boolean checkDumpPermission(Context context, String tag, PrintWriter pw) {
         if (context.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
                 != PackageManager.PERMISSION_GRANTED) {
@@ -112,6 +115,8 @@ public final class DumpUtils {
      * @return true if access should be granted.
      * @hide
      */
+    @android.ravenwood.annotation.RavenwoodThrow(
+            blockedBy = android.permission.PermissionManager.class)
     public static boolean checkUsageStatsPermission(Context context, String tag, PrintWriter pw) {
         // System internals always get access
         final int uid = Binder.getCallingUid();
@@ -166,6 +171,8 @@ public final class DumpUtils {
      * @return true if access should be granted.
      * @hide
      */
+    @android.ravenwood.annotation.RavenwoodThrow(
+            blockedBy = android.permission.PermissionManager.class)
     public static boolean checkDumpAndUsageStatsPermission(Context context, String tag,
             PrintWriter pw) {
         return checkDumpPermission(context, tag, pw) && checkUsageStatsPermission(context, tag, pw);
diff --git a/core/java/com/android/internal/util/FastMath.java b/core/java/com/android/internal/util/FastMath.java
index b7dbee53a4be..6e8fef281445 100644
--- a/core/java/com/android/internal/util/FastMath.java
+++ b/core/java/com/android/internal/util/FastMath.java
@@ -21,6 +21,7 @@ import android.compat.annotation.UnsupportedAppUsage;
 /**
  * Fast and loose math routines.
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class FastMath {
 
     /**
diff --git a/core/java/com/android/internal/util/FastPrintWriter.java b/core/java/com/android/internal/util/FastPrintWriter.java
index 63124def6d2f..fcd6df091c88 100644
--- a/core/java/com/android/internal/util/FastPrintWriter.java
+++ b/core/java/com/android/internal/util/FastPrintWriter.java
@@ -32,6 +32,7 @@ import java.nio.charset.CharsetEncoder;
 import java.nio.charset.CoderResult;
 import java.nio.charset.CodingErrorAction;
 
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class FastPrintWriter extends PrintWriter {
     private static class DummyWriter extends Writer {
         @Override
diff --git a/core/java/com/android/internal/util/GrowingArrayUtils.java b/core/java/com/android/internal/util/GrowingArrayUtils.java
index 8c12e36a27d1..83d06d180179 100644
--- a/core/java/com/android/internal/util/GrowingArrayUtils.java
+++ b/core/java/com/android/internal/util/GrowingArrayUtils.java
@@ -29,6 +29,7 @@ import android.os.Build;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public final class GrowingArrayUtils {
 
     /**
diff --git a/core/java/com/android/internal/util/HeavyHitterSketch.java b/core/java/com/android/internal/util/HeavyHitterSketch.java
index e18acaf36797..2973d305f517 100644
--- a/core/java/com/android/internal/util/HeavyHitterSketch.java
+++ b/core/java/com/android/internal/util/HeavyHitterSketch.java
@@ -35,6 +35,7 @@ import java.util.List;
  * <p>
  * {@hide}
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public interface HeavyHitterSketch<T> {
     /**
      * Return the default implementation.
diff --git a/core/java/com/android/internal/util/LineBreakBufferedWriter.java b/core/java/com/android/internal/util/LineBreakBufferedWriter.java
index 552a93f6666a..8393b229e011 100644
--- a/core/java/com/android/internal/util/LineBreakBufferedWriter.java
+++ b/core/java/com/android/internal/util/LineBreakBufferedWriter.java
@@ -27,6 +27,7 @@ import java.util.Arrays;
  *
  * Note: this class is not thread-safe.
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class LineBreakBufferedWriter extends PrintWriter {
 
     /**
diff --git a/core/java/com/android/internal/util/ObjectUtils.java b/core/java/com/android/internal/util/ObjectUtils.java
index 0e7b93d406f5..292ee14911c5 100644
--- a/core/java/com/android/internal/util/ObjectUtils.java
+++ b/core/java/com/android/internal/util/ObjectUtils.java
@@ -22,6 +22,7 @@ import android.annotation.Nullable;
 import java.util.Objects;
 
 /** @hide */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class ObjectUtils {
     private ObjectUtils() {}
 
diff --git a/core/java/com/android/internal/util/Parcelling.java b/core/java/com/android/internal/util/Parcelling.java
index 3147c34a7129..70c3869d8e23 100644
--- a/core/java/com/android/internal/util/Parcelling.java
+++ b/core/java/com/android/internal/util/Parcelling.java
@@ -38,6 +38,7 @@ import java.util.regex.Pattern;
  *
  * @param <T> the type being [un]parcelled
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public interface Parcelling<T> {
 
     /**
diff --git a/core/java/com/android/internal/util/ParseUtils.java b/core/java/com/android/internal/util/ParseUtils.java
index a591f4aa41fc..a16ce2b0570f 100644
--- a/core/java/com/android/internal/util/ParseUtils.java
+++ b/core/java/com/android/internal/util/ParseUtils.java
@@ -23,6 +23,7 @@ import android.annotation.Nullable;
  * Test:
  atest /android/pi-dev/frameworks/base/core/tests/coretests/src/com/android/internal/util/ParseUtilsTest.java
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public final class ParseUtils {
     private ParseUtils() {
     }
diff --git a/core/java/com/android/internal/util/ProcFileReader.java b/core/java/com/android/internal/util/ProcFileReader.java
index b726d5d75239..6cf241e65d00 100644
--- a/core/java/com/android/internal/util/ProcFileReader.java
+++ b/core/java/com/android/internal/util/ProcFileReader.java
@@ -32,6 +32,7 @@ import java.nio.charset.StandardCharsets;
  * Currently doesn't support formats based on {@code \0}, tabs.
  * Consecutive spaces are treated as a single delimiter.
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class ProcFileReader implements Closeable {
     private final InputStream mStream;
     private final byte[] mBuffer;
diff --git a/core/java/com/android/internal/util/ProgressReporter.java b/core/java/com/android/internal/util/ProgressReporter.java
index 7a8efba8a637..5640d8f28330 100644
--- a/core/java/com/android/internal/util/ProgressReporter.java
+++ b/core/java/com/android/internal/util/ProgressReporter.java
@@ -25,6 +25,7 @@ import android.os.RemoteException;
 import android.util.MathUtils;
 
 import com.android.internal.annotations.GuardedBy;
+import com.android.internal.annotations.VisibleForTesting;
 
 /**
  * Tracks and reports progress of a single task to a {@link IProgressListener}.
@@ -175,7 +176,8 @@ public class ProgressReporter {
         }
     }
 
-    int getProgress() {
+    @VisibleForTesting
+    public int getProgress() {
         return mProgress;
     }
 
diff --git a/core/java/com/android/internal/util/QuickSelect.java b/core/java/com/android/internal/util/QuickSelect.java
index 17739c9c8832..052efede2fba 100644
--- a/core/java/com/android/internal/util/QuickSelect.java
+++ b/core/java/com/android/internal/util/QuickSelect.java
@@ -28,6 +28,7 @@ import java.util.List;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public final class QuickSelect {
     private static <T> int selectImpl(@NonNull List<T> list, int left, int right, int k,
             @NonNull Comparator<? super T> comparator) {
diff --git a/core/java/com/android/internal/util/RingBuffer.java b/core/java/com/android/internal/util/RingBuffer.java
index 8fc4c30e54ab..04886598de35 100644
--- a/core/java/com/android/internal/util/RingBuffer.java
+++ b/core/java/com/android/internal/util/RingBuffer.java
@@ -27,6 +27,7 @@ import java.util.Arrays;
  * full, oldest events are dropped when new events are added.
  * {@hide}
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class RingBuffer<T> {
 
     // Array for storing events.
diff --git a/core/java/com/android/internal/util/StringPool.java b/core/java/com/android/internal/util/StringPool.java
index c5180a3fe8cf..94f6ec9677ec 100644
--- a/core/java/com/android/internal/util/StringPool.java
+++ b/core/java/com/android/internal/util/StringPool.java
@@ -23,6 +23,7 @@ package com.android.internal.util;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public final class StringPool {
 
     private final String[] mPool = new String[512];
diff --git a/core/java/com/android/internal/util/dump/DumpableContainerImpl.java b/core/java/com/android/internal/util/dump/DumpableContainerImpl.java
index ccec6c61b92a..bb5224f65904 100644
--- a/core/java/com/android/internal/util/dump/DumpableContainerImpl.java
+++ b/core/java/com/android/internal/util/dump/DumpableContainerImpl.java
@@ -32,6 +32,7 @@ import java.util.Objects;
  *
  * @hide
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public final class DumpableContainerImpl implements DumpableContainer {
 
     private static final String TAG = DumpableContainerImpl.class.getSimpleName();
diff --git a/core/java/com/google/android/collect/Lists.java b/core/java/com/google/android/collect/Lists.java
index 585847da566c..392b87e6bd04 100644
--- a/core/java/com/google/android/collect/Lists.java
+++ b/core/java/com/google/android/collect/Lists.java
@@ -25,6 +25,7 @@ import java.util.Collections;
  * Provides static methods for creating {@code List} instances easily, and other
  * utility methods for working with lists. 
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class Lists {
 
     /**
diff --git a/core/java/com/google/android/collect/Maps.java b/core/java/com/google/android/collect/Maps.java
index cd4c1280545e..6492b0350669 100644
--- a/core/java/com/google/android/collect/Maps.java
+++ b/core/java/com/google/android/collect/Maps.java
@@ -24,6 +24,7 @@ import java.util.HashMap;
 /**
  * Provides static methods for creating mutable {@code Maps} instances easily.
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class Maps {
     /**
      * Creates a {@code HashMap} instance.
diff --git a/core/java/com/google/android/collect/Sets.java b/core/java/com/google/android/collect/Sets.java
index e2429157d529..76eaf21cae04 100644
--- a/core/java/com/google/android/collect/Sets.java
+++ b/core/java/com/google/android/collect/Sets.java
@@ -31,6 +31,7 @@ import java.util.TreeSet;
  * other static methods for working with Sets.
  *
  */
+@android.ravenwood.annotation.RavenwoodKeepWholeClass
 public class Sets {
     
     /**
diff --git a/core/tests/coretests/Android.bp b/core/tests/coretests/Android.bp
index 37f592f5797b..0ad349ba5281 100644
--- a/core/tests/coretests/Android.bp
+++ b/core/tests/coretests/Android.bp
@@ -167,12 +167,24 @@ android_library {
 
 android_ravenwood_test {
     name: "FrameworksCoreTestsRavenwood",
+    libs: [
+        "android.test.runner",
+        "android.test.base",
+    ],
     static_libs: [
+        "core-test-rules", // for libcore.dalvik.system.CloseGuardSupport
+        "androidx.core_core",
         "androidx.annotation_annotation",
         "androidx.test.rules",
+        "androidx.test.ext.junit",
+        "mockito_ravenwood",
+        "platform-test-annotations",
     ],
     srcs: [
         "src/android/os/FileUtilsTest.java",
+        "src/android/util/**/*.java",
+        "src/com/android/internal/util/**/*.java",
+        "testdoubles/src/com/android/internal/util/**/*.java",
     ],
     auto_gen_config: true,
 }
diff --git a/core/tests/coretests/src/android/util/ArrayMapTest.java b/core/tests/coretests/src/android/util/ArrayMapTest.java
index b212cf6b0803..1e444adbc362 100644
--- a/core/tests/coretests/src/android/util/ArrayMapTest.java
+++ b/core/tests/coretests/src/android/util/ArrayMapTest.java
@@ -14,11 +14,17 @@
 
 package android.util;
 
-import androidx.test.filters.LargeTest;
+import static org.junit.Assert.fail;
+
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 
-import junit.framework.TestCase;
+import androidx.test.filters.LargeTest;
+import androidx.test.runner.AndroidJUnit4;
 
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.ConcurrentModificationException;
 
@@ -26,10 +32,14 @@ import java.util.ConcurrentModificationException;
  * Unit tests for ArrayMap that don't belong in CTS.
  */
 @LargeTest
-public class ArrayMapTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class ArrayMapTest {
     private static final String TAG = "ArrayMapTest";
     ArrayMap<String, String> map = new ArrayMap<>();
 
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     /**
      * Attempt to generate a ConcurrentModificationException in ArrayMap.
      * <p>
@@ -41,6 +51,7 @@ public class ArrayMapTest extends TestCase {
      * @throws Exception
      */
     @Test
+    @IgnoreUnderRavenwood(reason = "Long test runtime")
     public void testConcurrentModificationException() throws Exception {
         final int TEST_LEN_MS = 5000;
         System.out.println("Starting ArrayMap concurrency test");
diff --git a/core/tests/coretests/src/android/util/ArraySetTest.java b/core/tests/coretests/src/android/util/ArraySetTest.java
index f1bebfb9bd93..51de6341179b 100644
--- a/core/tests/coretests/src/android/util/ArraySetTest.java
+++ b/core/tests/coretests/src/android/util/ArraySetTest.java
@@ -16,12 +16,14 @@
 
 package android.util;
 
-import androidx.test.filters.LargeTest;
+import static org.junit.Assert.fail;
 
-import junit.framework.TestCase;
+import androidx.test.filters.LargeTest;
+import androidx.test.runner.AndroidJUnit4;
 
 import org.junit.After;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.ConcurrentModificationException;
 
@@ -29,7 +31,8 @@ import java.util.ConcurrentModificationException;
  * Unit tests for ArraySet that don't belong in CTS.
  */
 @LargeTest
-public class ArraySetTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class ArraySetTest {
     private static final String TAG = "ArraySetTest";
     ArraySet<String> mSet = new ArraySet<>();
 
diff --git a/core/tests/coretests/src/android/util/Base64Test.java b/core/tests/coretests/src/android/util/Base64Test.java
index 15c51af0b3e1..b64826611f81 100644
--- a/core/tests/coretests/src/android/util/Base64Test.java
+++ b/core/tests/coretests/src/android/util/Base64Test.java
@@ -16,9 +16,16 @@
 
 package android.util;
 
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
 import androidx.test.filters.LargeTest;
+import androidx.test.runner.AndroidJUnit4;
 
-import junit.framework.TestCase;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
@@ -32,7 +39,8 @@ import java.util.Random;
 import java.util.stream.Collectors;
 
 @LargeTest
-public class Base64Test extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class Base64Test {
     private static final String TAG = "Base64Test";
 
     /** Decodes a string, returning a string. */
@@ -62,7 +70,7 @@ public class Base64Test extends TestCase {
     }
 
     /** Assert that actual equals the first len bytes of expected. */
-    private void assertEquals(byte[] expected, int len, byte[] actual) {
+    private void assertPartialEquals(byte[] expected, int len, byte[] actual) {
         assertEquals(len, actual.length);
         for (int i = 0; i < len; ++i) {
             assertEquals(expected[i], actual[i]);
@@ -70,21 +78,14 @@ public class Base64Test extends TestCase {
     }
 
     /** Assert that actual equals the first len bytes of expected. */
-    private void assertEquals(byte[] expected, int len, byte[] actual, int alen) {
+    private void assertPartialEquals(byte[] expected, int len, byte[] actual, int alen) {
         assertEquals(len, alen);
         for (int i = 0; i < len; ++i) {
             assertEquals(expected[i], actual[i]);
         }
     }
 
-    /** Assert that actual equals the first len bytes of expected. */
-    private void assertEquals(byte[] expected, byte[] actual) {
-        assertEquals(expected.length, actual.length);
-        for (int i = 0; i < expected.length; ++i) {
-            assertEquals(expected[i], actual[i]);
-        }
-    }
-
+    @Test
     public void testDecodeExtraChars() throws Exception {
         // padding 0
         assertEquals("hello, world", decodeString("aGVsbG8sIHdvcmxk"));
@@ -131,28 +132,30 @@ public class Base64Test extends TestCase {
                                           (byte) 0xcc, (byte) 0xbb, (byte) 0xaa,
                                           (byte) 0x99, (byte) 0x88, (byte) 0x77 };
 
+    @Test
     public void testBinaryDecode() throws Exception {
-        assertEquals(BYTES, 0, Base64.decode("", 0));
-        assertEquals(BYTES, 1, Base64.decode("/w==", 0));
-        assertEquals(BYTES, 2, Base64.decode("/+4=", 0));
-        assertEquals(BYTES, 3, Base64.decode("/+7d", 0));
-        assertEquals(BYTES, 4, Base64.decode("/+7dzA==", 0));
-        assertEquals(BYTES, 5, Base64.decode("/+7dzLs=", 0));
-        assertEquals(BYTES, 6, Base64.decode("/+7dzLuq", 0));
-        assertEquals(BYTES, 7, Base64.decode("/+7dzLuqmQ==", 0));
-        assertEquals(BYTES, 8, Base64.decode("/+7dzLuqmYg=", 0));
+        assertPartialEquals(BYTES, 0, Base64.decode("", 0));
+        assertPartialEquals(BYTES, 1, Base64.decode("/w==", 0));
+        assertPartialEquals(BYTES, 2, Base64.decode("/+4=", 0));
+        assertPartialEquals(BYTES, 3, Base64.decode("/+7d", 0));
+        assertPartialEquals(BYTES, 4, Base64.decode("/+7dzA==", 0));
+        assertPartialEquals(BYTES, 5, Base64.decode("/+7dzLs=", 0));
+        assertPartialEquals(BYTES, 6, Base64.decode("/+7dzLuq", 0));
+        assertPartialEquals(BYTES, 7, Base64.decode("/+7dzLuqmQ==", 0));
+        assertPartialEquals(BYTES, 8, Base64.decode("/+7dzLuqmYg=", 0));
     }
 
+    @Test
     public void testWebSafe() throws Exception {
-        assertEquals(BYTES, 0, Base64.decode("", Base64.URL_SAFE));
-        assertEquals(BYTES, 1, Base64.decode("_w==", Base64.URL_SAFE));
-        assertEquals(BYTES, 2, Base64.decode("_-4=", Base64.URL_SAFE));
-        assertEquals(BYTES, 3, Base64.decode("_-7d", Base64.URL_SAFE));
-        assertEquals(BYTES, 4, Base64.decode("_-7dzA==", Base64.URL_SAFE));
-        assertEquals(BYTES, 5, Base64.decode("_-7dzLs=", Base64.URL_SAFE));
-        assertEquals(BYTES, 6, Base64.decode("_-7dzLuq", Base64.URL_SAFE));
-        assertEquals(BYTES, 7, Base64.decode("_-7dzLuqmQ==", Base64.URL_SAFE));
-        assertEquals(BYTES, 8, Base64.decode("_-7dzLuqmYg=", Base64.URL_SAFE));
+        assertPartialEquals(BYTES, 0, Base64.decode("", Base64.URL_SAFE));
+        assertPartialEquals(BYTES, 1, Base64.decode("_w==", Base64.URL_SAFE));
+        assertPartialEquals(BYTES, 2, Base64.decode("_-4=", Base64.URL_SAFE));
+        assertPartialEquals(BYTES, 3, Base64.decode("_-7d", Base64.URL_SAFE));
+        assertPartialEquals(BYTES, 4, Base64.decode("_-7dzA==", Base64.URL_SAFE));
+        assertPartialEquals(BYTES, 5, Base64.decode("_-7dzLs=", Base64.URL_SAFE));
+        assertPartialEquals(BYTES, 6, Base64.decode("_-7dzLuq", Base64.URL_SAFE));
+        assertPartialEquals(BYTES, 7, Base64.decode("_-7dzLuqmQ==", Base64.URL_SAFE));
+        assertPartialEquals(BYTES, 8, Base64.decode("_-7dzLuqmYg=", Base64.URL_SAFE));
 
         assertEquals("", Base64.encodeToString(BYTES, 0, 0, Base64.URL_SAFE));
         assertEquals("_w==\n", Base64.encodeToString(BYTES, 0, 1, Base64.URL_SAFE));
@@ -165,6 +168,7 @@ public class Base64Test extends TestCase {
         assertEquals("_-7dzLuqmYg=\n", Base64.encodeToString(BYTES, 0, 8, Base64.URL_SAFE));
     }
 
+    @Test
     public void testFlags() throws Exception {
         assertEquals("YQ==\n",       encodeToString("a", 0));
         assertEquals("YQ==",         encodeToString("a", Base64.NO_WRAP));
@@ -195,6 +199,7 @@ public class Base64Test extends TestCase {
         assertEquals("YWJjZA\r\n",   encodeToString("abcd", Base64.CRLF | Base64.NO_PADDING));
     }
 
+    @Test
     public void testLineLength() throws Exception {
         String in_56 = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcd";
         String in_57 = in_56 + "e";
@@ -245,7 +250,9 @@ public class Base64Test extends TestCase {
      * us to get at package-private members (Base64.Encoder in
      * this case).
      */
-    public void XXXtestEncodeInternal() throws Exception {
+    @Test
+    @Ignore
+    public void testEncodeInternal() throws Exception {
         byte[] input = { (byte) 0x61, (byte) 0x62, (byte) 0x63 };
         byte[] output = new byte[100];
 
@@ -253,11 +260,11 @@ public class Base64Test extends TestCase {
                                                     output);
 
         encoder.process(input, 0, 3, false);
-        assertEquals("YWJj".getBytes(), 4, encoder.output, encoder.op);
+        assertPartialEquals("YWJj".getBytes(), 4, encoder.output, encoder.op);
         assertEquals(0, encoder.tailLen);
 
         encoder.process(input, 0, 3, false);
-        assertEquals("YWJj".getBytes(), 4, encoder.output, encoder.op);
+        assertPartialEquals("YWJj".getBytes(), 4, encoder.output, encoder.op);
         assertEquals(0, encoder.tailLen);
 
         encoder.process(input, 0, 1, false);
@@ -269,7 +276,7 @@ public class Base64Test extends TestCase {
         assertEquals(2, encoder.tailLen);
 
         encoder.process(input, 0, 1, false);
-        assertEquals("YWFh".getBytes(), 4, encoder.output, encoder.op);
+        assertPartialEquals("YWFh".getBytes(), 4, encoder.output, encoder.op);
         assertEquals(0, encoder.tailLen);
 
         encoder.process(input, 0, 2, false);
@@ -277,15 +284,15 @@ public class Base64Test extends TestCase {
         assertEquals(2, encoder.tailLen);
 
         encoder.process(input, 0, 2, false);
-        assertEquals("YWJh".getBytes(), 4, encoder.output, encoder.op);
+        assertPartialEquals("YWJh".getBytes(), 4, encoder.output, encoder.op);
         assertEquals(1, encoder.tailLen);
 
         encoder.process(input, 0, 2, false);
-        assertEquals("YmFi".getBytes(), 4, encoder.output, encoder.op);
+        assertPartialEquals("YmFi".getBytes(), 4, encoder.output, encoder.op);
         assertEquals(0, encoder.tailLen);
 
         encoder.process(input, 0, 1, true);
-        assertEquals("YQ".getBytes(), 2, encoder.output, encoder.op);
+        assertPartialEquals("YQ".getBytes(), 2, encoder.output, encoder.op);
     }
 
     private static final String lipsum =
@@ -311,6 +318,7 @@ public class Base64Test extends TestCase {
             "molestie dapibus commodo. Ut vel tellus at massa gravida " +
             "semper non sed orci.";
 
+    @Test
     public void testInputStream() throws Exception {
         int[] flagses = { Base64.DEFAULT,
                           Base64.NO_PADDING,
@@ -343,7 +351,7 @@ public class Base64Test extends TestCase {
             while ((b = b64is.read(actual, ap, actual.length-ap)) != -1) {
                 ap += b;
             }
-            assertEquals(actual, ap, plain);
+            assertPartialEquals(actual, ap, plain);
 
             // read individual bytes
             bais = new ByteArrayInputStream(encoded);
@@ -352,7 +360,7 @@ public class Base64Test extends TestCase {
             while ((b = b64is.read()) != -1) {
                 actual[ap++] = (byte) b;
             }
-            assertEquals(actual, ap, plain);
+            assertPartialEquals(actual, ap, plain);
 
             // mix reads of variously-sized arrays with one-byte reads
             bais = new ByteArrayInputStream(encoded);
@@ -371,7 +379,7 @@ public class Base64Test extends TestCase {
                     }
                 }
             }
-            assertEquals(actual, ap, plain);
+            assertPartialEquals(actual, ap, plain);
 
             // ----- test encoding ("plain" -> "encoded") -----
 
@@ -382,7 +390,7 @@ public class Base64Test extends TestCase {
             while ((b = b64is.read(actual, ap, actual.length-ap)) != -1) {
                 ap += b;
             }
-            assertEquals(actual, ap, encoded);
+            assertPartialEquals(actual, ap, encoded);
 
             // read individual bytes
             bais = new ByteArrayInputStream(plain);
@@ -391,7 +399,7 @@ public class Base64Test extends TestCase {
             while ((b = b64is.read()) != -1) {
                 actual[ap++] = (byte) b;
             }
-            assertEquals(actual, ap, encoded);
+            assertPartialEquals(actual, ap, encoded);
 
             // mix reads of variously-sized arrays with one-byte reads
             bais = new ByteArrayInputStream(plain);
@@ -410,11 +418,12 @@ public class Base64Test extends TestCase {
                     }
                 }
             }
-            assertEquals(actual, ap, encoded);
+            assertPartialEquals(actual, ap, encoded);
         }
     }
 
     /** http://b/3026478 */
+    @Test
     public void testSingleByteReads() throws IOException {
         InputStream in = new Base64InputStream(
                 new ByteArrayInputStream("/v8=".getBytes()), Base64.DEFAULT);
@@ -426,6 +435,7 @@ public class Base64Test extends TestCase {
      * Tests that Base64OutputStream produces exactly the same results
      * as calling Base64.encode/.decode on an in-memory array.
      */
+    @Test
     public void testOutputStream() throws Exception {
         int[] flagses = { Base64.DEFAULT,
                           Base64.NO_PADDING,
@@ -456,7 +466,7 @@ public class Base64Test extends TestCase {
             b64os.write(plain);
             b64os.close();
             actual = baos.toByteArray();
-            assertEquals(encoded, actual);
+            assertArrayEquals(encoded, actual);
 
             // many calls to write(int)
             baos = new ByteArrayOutputStream();
@@ -466,7 +476,7 @@ public class Base64Test extends TestCase {
             }
             b64os.close();
             actual = baos.toByteArray();
-            assertEquals(encoded, actual);
+            assertArrayEquals(encoded, actual);
 
             // intermixed sequences of write(int) with
             // write(byte[],int,int) of various lengths.
@@ -489,7 +499,7 @@ public class Base64Test extends TestCase {
             }
             b64os.close();
             actual = baos.toByteArray();
-            assertEquals(encoded, actual);
+            assertArrayEquals(encoded, actual);
 
             // ----- test decoding ("encoded" -> "plain") -----
 
@@ -499,7 +509,7 @@ public class Base64Test extends TestCase {
             b64os.write(encoded);
             b64os.close();
             actual = baos.toByteArray();
-            assertEquals(plain, actual);
+            assertArrayEquals(plain, actual);
 
             // many calls to write(int)
             baos = new ByteArrayOutputStream();
@@ -509,7 +519,7 @@ public class Base64Test extends TestCase {
             }
             b64os.close();
             actual = baos.toByteArray();
-            assertEquals(plain, actual);
+            assertArrayEquals(plain, actual);
 
             // intermixed sequences of write(int) with
             // write(byte[],int,int) of various lengths.
@@ -532,10 +542,11 @@ public class Base64Test extends TestCase {
             }
             b64os.close();
             actual = baos.toByteArray();
-            assertEquals(plain, actual);
+            assertArrayEquals(plain, actual);
         }
     }
 
+    @Test
     public void testOutputStream_ioExceptionDuringClose() {
         OutputStream out = new OutputStream() {
             @Override public void write(int b) throws IOException { }
@@ -551,6 +562,7 @@ public class Base64Test extends TestCase {
         }
     }
 
+    @Test
     public void testOutputStream_ioExceptionDuringCloseAndWrite() {
         OutputStream out = new OutputStream() {
             @Override public void write(int b) throws IOException {
@@ -583,6 +595,7 @@ public class Base64Test extends TestCase {
         }
     }
 
+    @Test
     public void testOutputStream_ioExceptionDuringWrite() {
         OutputStream out = new OutputStream() {
             @Override public void write(int b) throws IOException {
diff --git a/core/tests/coretests/src/android/util/CharsetUtilsTest.java b/core/tests/coretests/src/android/util/CharsetUtilsTest.java
index c29545168758..fbbe311d44fb 100644
--- a/core/tests/coretests/src/android/util/CharsetUtilsTest.java
+++ b/core/tests/coretests/src/android/util/CharsetUtilsTest.java
@@ -18,6 +18,9 @@ package android.util;
 
 import static org.junit.Assert.assertEquals;
 
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
+
 import androidx.test.runner.AndroidJUnit4;
 
 import com.android.internal.util.HexDump;
@@ -25,18 +28,25 @@ import com.android.internal.util.HexDump;
 import dalvik.system.VMRuntime;
 
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
 @RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = CharsetUtils.class)
 public class CharsetUtilsTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     private byte[] dest;
     private long destPtr;
 
     @Before
     public void setUp() {
-        dest = (byte[]) VMRuntime.getRuntime().newNonMovableArray(byte.class, 8);
-        destPtr = VMRuntime.getRuntime().addressOf(dest);
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            dest = (byte[]) VMRuntime.getRuntime().newNonMovableArray(byte.class, 8);
+            destPtr = VMRuntime.getRuntime().addressOf(dest);
+        }
     }
 
     @Test
diff --git a/core/tests/coretests/src/android/util/CloseGuardTest.java b/core/tests/coretests/src/android/util/CloseGuardTest.java
index d86c7b79fad6..15c57b1aa6f7 100644
--- a/core/tests/coretests/src/android/util/CloseGuardTest.java
+++ b/core/tests/coretests/src/android/util/CloseGuardTest.java
@@ -16,6 +16,9 @@
 
 package android.util;
 
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
+
 import libcore.dalvik.system.CloseGuardSupport;
 
 import org.junit.Rule;
@@ -23,10 +26,21 @@ import org.junit.Test;
 import org.junit.rules.TestRule;
 
 /** Unit tests for {@link android.util.CloseGuard} */
+@IgnoreUnderRavenwood(blockedBy = CloseGuard.class)
 public class CloseGuardTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
 
     @Rule
-    public final TestRule rule = CloseGuardSupport.getRule();
+    public final TestRule rule;
+
+    public CloseGuardTest() {
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            rule = CloseGuardSupport.getRule();
+        } else {
+            rule = null;
+        }
+    }
 
     @Test
     public void testEnabled_NotOpen() throws Throwable {
diff --git a/core/tests/coretests/src/android/util/DayOfMonthCursorTest.java b/core/tests/coretests/src/android/util/DayOfMonthCursorTest.java
index 572e9b062097..72bd578ad8b9 100644
--- a/core/tests/coretests/src/android/util/DayOfMonthCursorTest.java
+++ b/core/tests/coretests/src/android/util/DayOfMonthCursorTest.java
@@ -16,30 +16,40 @@
 
 package android.util;
 
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
-import junit.framework.TestCase;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.Calendar;
 
 /**
  * Unit tests for {@link DayOfMonthCursor}.
  */
-public class DayOfMonthCursorTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class DayOfMonthCursorTest {
 
+    @Test
     @SmallTest
     public void testMonthRows() {
         DayOfMonthCursor mc = new DayOfMonthCursor(2007,
                 Calendar.SEPTEMBER, 11, Calendar.SUNDAY);
 
-        assertArraysEqual(new int[]{26, 27, 28, 29, 30, 31, 1},
+        assertArrayEquals(new int[]{26, 27, 28, 29, 30, 31, 1},
                 mc.getDigitsForRow(0));
-        assertArraysEqual(new int[]{2, 3, 4, 5, 6, 7, 8},
+        assertArrayEquals(new int[]{2, 3, 4, 5, 6, 7, 8},
                 mc.getDigitsForRow(1));
-        assertArraysEqual(new int[]{30, 1, 2, 3, 4, 5, 6},
+        assertArrayEquals(new int[]{30, 1, 2, 3, 4, 5, 6},
                 mc.getDigitsForRow(5));
     }
 
+    @Test
     @SmallTest
     public void testMoveLeft() {
         DayOfMonthCursor mc = new DayOfMonthCursor(2007,
@@ -70,6 +80,7 @@ public class DayOfMonthCursorTest extends TestCase {
         assertEquals(5, mc.getSelectedColumn());
     }
 
+    @Test
     @SmallTest
     public void testMoveRight() {
         DayOfMonthCursor mc = new DayOfMonthCursor(2007,
@@ -100,6 +111,7 @@ public class DayOfMonthCursorTest extends TestCase {
         assertEquals(1, mc.getSelectedColumn());
     }
 
+    @Test
     @SmallTest
     public void testMoveUp() {
         DayOfMonthCursor mc = new DayOfMonthCursor(2007,
@@ -124,6 +136,7 @@ public class DayOfMonthCursorTest extends TestCase {
         assertEquals(4, mc.getSelectedColumn());
     }
 
+    @Test
     @SmallTest
     public void testMoveDown() {
         DayOfMonthCursor mc = new DayOfMonthCursor(2007,
@@ -147,12 +160,4 @@ public class DayOfMonthCursorTest extends TestCase {
         assertEquals(1, mc.getSelectedRow());
         assertEquals(0, mc.getSelectedColumn());
     }
-
-    private void assertArraysEqual(int[] expected, int[] actual) {
-        assertEquals("array length", expected.length, actual.length);
-        for (int i = 0; i < expected.length; i++) {
-            assertEquals("index " + i,
-                    expected[i], actual[i]);
-        }
-    }
 }
diff --git a/core/tests/coretests/src/android/util/HashedStringCacheTest.java b/core/tests/coretests/src/android/util/HashedStringCacheTest.java
index 229247353a52..08c85ac5c0d6 100644
--- a/core/tests/coretests/src/android/util/HashedStringCacheTest.java
+++ b/core/tests/coretests/src/android/util/HashedStringCacheTest.java
@@ -26,28 +26,37 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.os.Environment;
 import android.os.storage.StorageManager;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 
 import androidx.test.InstrumentationRegistry;
 
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 
 import java.io.File;
 
-
 /**
  * Unit tests for {@link HashedStringCache}.
  */
+@IgnoreUnderRavenwood(blockedBy = HashedStringCache.class)
 public class HashedStringCacheTest {
     private static final String TAG = "HashedStringCacheTest";
     private Context mContext;
     private static final String TEST_STRING = "test_string";
 
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     @Before
     public void setup() {
-        mContext = null;
-        mContext = InstrumentationRegistry.getContext();
-        clearSharedPreferences();
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            mContext = InstrumentationRegistry.getContext();
+            clearSharedPreferences();
+        } else {
+            mContext = null;
+        }
     }
 
     @Test
diff --git a/core/tests/coretests/src/android/util/LogNullabilityTest.java b/core/tests/coretests/src/android/util/LogNullabilityTest.java
index 370885d3d4ac..475e347141df 100644
--- a/core/tests/coretests/src/android/util/LogNullabilityTest.java
+++ b/core/tests/coretests/src/android/util/LogNullabilityTest.java
@@ -19,6 +19,8 @@ package android.util;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.fail;
 
+import android.platform.test.ravenwood.RavenwoodRule;
+
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
@@ -35,8 +37,10 @@ public final class LogNullabilityTest {
         Log.i(null, "");
         Log.w(null, "");
         Log.e(null, "");
-        Log.wtf(null, "");
-        Log.wtfStack(null, "");
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            Log.wtf(null, "");
+            Log.wtfStack(null, "");
+        }
         Log.println(Log.INFO, null, "");
 
         // Implicit assertions of not crashing.
@@ -49,7 +53,9 @@ public final class LogNullabilityTest {
         Log.i(null, "", new Throwable());
         Log.w(null, "", new Throwable());
         Log.e(null, "", new Throwable());
-        Log.wtf(null, "", new Throwable());
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            Log.wtf(null, "", new Throwable());
+        }
         Log.printlns(Log.LOG_ID_MAIN, Log.INFO, null, "", new Throwable());
 
         // Implicit assertions of not crashing.
@@ -84,8 +90,10 @@ public final class LogNullabilityTest {
         } catch (NullPointerException expected) {
         }
 
-        Log.wtf("", (String) null);
-        Log.wtfStack("", (String) null);
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            Log.wtf("", (String) null);
+            Log.wtfStack("", (String) null);
+        }
 
         // Implicit assertion of not crashing.
 
@@ -103,15 +111,10 @@ public final class LogNullabilityTest {
         Log.i("", null, new Throwable());
         Log.w("", null, new Throwable());
         Log.e("", null, new Throwable());
-        Log.wtf("", null, new Throwable());
-
-        // Implicit assertions of not crashing.
-
-        try {
-            Log.printlns(Log.LOG_ID_MAIN, Log.INFO, "", null, new Throwable());
-            fail();
-        } catch (NullPointerException expected) {
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            Log.wtf("", null, new Throwable());
         }
+        Log.printlns(Log.LOG_ID_MAIN, Log.INFO, "", null, new Throwable());
     }
 
     @Test
@@ -121,7 +124,9 @@ public final class LogNullabilityTest {
         Log.i("", "", null);
         Log.w("", "", null);
         Log.e("", "", null);
-        Log.wtf("", "", null);
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            Log.wtf("", "", null);
+        }
 
         // Warning has its own (String, Throwable) overload.
         Log.w("", (Throwable) null);
@@ -131,10 +136,12 @@ public final class LogNullabilityTest {
         // Implicit assertions of not crashing.
 
         // WTF has its own (String, Throwable) overload with different behavior.
-        try {
-            Log.wtf("", (Throwable) null);
-            fail();
-        } catch (NullPointerException expected) {
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            try {
+                Log.wtf("", (Throwable) null);
+                fail();
+            } catch (NullPointerException expected) {
+            }
         }
     }
 
@@ -145,15 +152,10 @@ public final class LogNullabilityTest {
         Log.i("", null, null);
         Log.w("", null, null);
         Log.e("", null, null);
-        Log.wtf("", null, null);
-
-        // Implicit assertions of not crashing.
-
-        try {
-            Log.printlns(Log.LOG_ID_MAIN, Log.INFO, "", null, null);
-            fail();
-        } catch (NullPointerException expected) {
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            Log.wtf("", null, null);
         }
+        Log.printlns(Log.LOG_ID_MAIN, Log.INFO, "", null, null);
     }
 
     @Test
diff --git a/core/tests/coretests/src/android/util/LogTest.java b/core/tests/coretests/src/android/util/LogTest.java
index d783c127d8c4..f9966a1cf65d 100644
--- a/core/tests/coretests/src/android/util/LogTest.java
+++ b/core/tests/coretests/src/android/util/LogTest.java
@@ -20,23 +20,24 @@ import android.os.SystemProperties;
 import android.test.PerformanceTestCase;
 
 import androidx.test.filters.Suppress;
+import androidx.test.runner.AndroidJUnit4;
 
 import junit.framework.TestCase;
 
+import org.junit.Assert;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
 //This is an empty TestCase.
 @Suppress
-public class LogTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class LogTest {
     private static final String PROPERTY_TAG = "log.tag.LogTest";
     private static final String LOG_TAG = "LogTest";
 
-
-    // TODO: remove this test once we uncomment out the following test.
-    public void testLogTestDummy() {
-      return;
-    }
-
-
-    /* TODO: This test is commented out because we will not be able to set properities. Fix the test.
+    @Test
+    @Ignore
     public void testIsLoggable() {
         // First clear any SystemProperty setting for our test key.
         SystemProperties.set(PROPERTY_TAG, null);
@@ -129,8 +130,7 @@ public class LogTest extends TestCase {
         Assert.assertFalse(Log.isLoggable(LOG_TAG, Log.ERROR));
         Assert.assertFalse(Log.isLoggable(LOG_TAG, Log.ASSERT));
     }
-    */
-    
+
     public static class PerformanceTest extends TestCase implements PerformanceTestCase {
         private static final int ITERATIONS = 1000;
 
diff --git a/core/tests/coretests/src/android/util/LongSparseLongArrayTest.java b/core/tests/coretests/src/android/util/LongSparseLongArrayTest.java
index a1d48e689427..9dbaae0d0555 100644
--- a/core/tests/coretests/src/android/util/LongSparseLongArrayTest.java
+++ b/core/tests/coretests/src/android/util/LongSparseLongArrayTest.java
@@ -16,9 +16,13 @@
 
 package android.util;
 
+import static org.junit.Assert.assertEquals;
+
 import androidx.test.filters.LargeTest;
+import androidx.test.runner.AndroidJUnit4;
 
-import junit.framework.TestCase;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.HashMap;
 import java.util.Iterator;
@@ -29,9 +33,11 @@ import java.util.Random;
  * Tests for {@link LongSparseLongArray}.
  */
 @LargeTest
-public class LongSparseLongArrayTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class LongSparseLongArrayTest {
     private static final String TAG = "LongSparseLongArrayTest";
 
+    @Test
     public void testSimplePut() throws Exception {
         final LongSparseLongArray array = new LongSparseLongArray(5);
         for (int i = 0; i < 48; i++) {
@@ -45,6 +51,7 @@ public class LongSparseLongArrayTest extends TestCase {
         }
     }
 
+    @Test
     public void testSimplePutBackwards() throws Exception {
         final LongSparseLongArray array = new LongSparseLongArray(5);
         for (int i = 47; i >= 0; i--) {
@@ -58,6 +65,7 @@ public class LongSparseLongArrayTest extends TestCase {
         }
     }
 
+    @Test
     public void testMiddleInsert() throws Exception {
         final LongSparseLongArray array = new LongSparseLongArray(5);
         for (int i = 0; i < 48; i++) {
@@ -74,6 +82,7 @@ public class LongSparseLongArrayTest extends TestCase {
         assertEquals(1024, array.get(special, -1));
     }
 
+    @Test
     public void testFuzz() throws Exception {
         final Random r = new Random();
 
diff --git a/core/tests/coretests/src/android/util/LruCacheTest.java b/core/tests/coretests/src/android/util/LruCacheTest.java
index 1928bfdfc61d..10e8308e7964 100644
--- a/core/tests/coretests/src/android/util/LruCacheTest.java
+++ b/core/tests/coretests/src/android/util/LruCacheTest.java
@@ -16,7 +16,14 @@
 
 package android.util;
 
-import junit.framework.TestCase;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.fail;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -24,13 +31,15 @@ import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
-public final class LruCacheTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public final class LruCacheTest {
     private int expectedCreateCount;
     private int expectedPutCount;
     private int expectedHitCount;
     private int expectedMissCount;
     private int expectedEvictionCount;
 
+    @Test
     public void testStatistics() {
         LruCache<String, String> cache = new LruCache<String, String>(3);
         assertStatistics(cache);
@@ -80,6 +89,7 @@ public final class LruCacheTest extends TestCase {
         assertSnapshot(cache, "e", "E", "b", "B", "c", "C");
     }
 
+    @Test
     public void testStatisticsWithCreate() {
         LruCache<String, String> cache = newCreatingCache();
         assertStatistics(cache);
@@ -104,18 +114,21 @@ public final class LruCacheTest extends TestCase {
         assertSnapshot(cache, "cc", "created-cc", "dd", "created-dd", "aa", "created-aa");
     }
 
+    @Test
     public void testCreateOnCacheMiss() {
         LruCache<String, String> cache = newCreatingCache();
         String created = cache.get("aa");
         assertEquals("created-aa", created);
     }
 
+    @Test
     public void testNoCreateOnCacheHit() {
         LruCache<String, String> cache = newCreatingCache();
         cache.put("aa", "put-aa");
         assertEquals("put-aa", cache.get("aa"));
     }
 
+    @Test
     public void testConstructorDoesNotAllowZeroCacheSize() {
         try {
             new LruCache<String, String>(0);
@@ -124,6 +137,7 @@ public final class LruCacheTest extends TestCase {
         }
     }
 
+    @Test
     public void testCannotPutNullKey() {
         LruCache<String, String> cache = new LruCache<String, String>(3);
         try {
@@ -133,6 +147,7 @@ public final class LruCacheTest extends TestCase {
         }
     }
 
+    @Test
     public void testCannotPutNullValue() {
         LruCache<String, String> cache = new LruCache<String, String>(3);
         try {
@@ -142,6 +157,7 @@ public final class LruCacheTest extends TestCase {
         }
     }
 
+    @Test
     public void testToString() {
         LruCache<String, String> cache = new LruCache<String, String>(3);
         assertEquals("LruCache[maxSize=3,hits=0,misses=0,hitRate=0%]", cache.toString());
@@ -160,6 +176,7 @@ public final class LruCacheTest extends TestCase {
         assertEquals("LruCache[maxSize=3,hits=3,misses=2,hitRate=60%]", cache.toString());
     }
 
+    @Test
     public void testEvictionWithSingletonCache() {
         LruCache<String, String> cache = new LruCache<String, String>(1);
         cache.put("a", "A");
@@ -167,6 +184,7 @@ public final class LruCacheTest extends TestCase {
         assertSnapshot(cache, "b", "B");
     }
 
+    @Test
     public void testEntryEvictedWhenFull() {
         List<String> log = new ArrayList<String>();
         LruCache<String, String> cache = newRemovalLogCache(log);
@@ -184,6 +202,7 @@ public final class LruCacheTest extends TestCase {
      * Replacing the value for a key doesn't cause an eviction but it does bring
      * the replaced entry to the front of the queue.
      */
+    @Test
     public void testPutCauseEviction() {
         List<String> log = new ArrayList<String>();
         LruCache<String, String> cache = newRemovalLogCache(log);
@@ -196,6 +215,7 @@ public final class LruCacheTest extends TestCase {
         assertSnapshot(cache, "a", "A", "c", "C", "b", "B2");
     }
 
+    @Test
     public void testCustomSizesImpactsSize() {
         LruCache<String, String> cache = new LruCache<String, String>(10) {
             @Override protected int sizeOf(String key, String value) {
@@ -212,6 +232,7 @@ public final class LruCacheTest extends TestCase {
         assertEquals(6, cache.size());
     }
 
+    @Test
     public void testEvictionWithCustomSizes() {
         LruCache<String, String> cache = new LruCache<String, String>(4) {
             @Override protected int sizeOf(String key, String value) {
@@ -241,6 +262,7 @@ public final class LruCacheTest extends TestCase {
         assertSnapshot(cache, "j", "JJJ");
     }
 
+    @Test
     public void testEvictionThrowsWhenSizesAreInconsistent() {
         LruCache<String, int[]> cache = new LruCache<String, int[]>(4) {
             @Override protected int sizeOf(String key, int[] value) {
@@ -263,6 +285,7 @@ public final class LruCacheTest extends TestCase {
         }
     }
 
+    @Test
     public void testEvictionThrowsWhenSizesAreNegative() {
         LruCache<String, String> cache = new LruCache<String, String>(4) {
             @Override protected int sizeOf(String key, String value) {
@@ -282,6 +305,7 @@ public final class LruCacheTest extends TestCase {
      * because evicting a small element may be insufficient to make room for a
      * large element.
      */
+    @Test
     public void testDifferentElementSizes() {
         LruCache<String, String> cache = new LruCache<String, String>(10) {
             @Override protected int sizeOf(String key, String value) {
@@ -299,6 +323,7 @@ public final class LruCacheTest extends TestCase {
         assertSnapshot(cache, "e", "12345678");
     }
 
+    @Test
     public void testEvictAll() {
         List<String> log = new ArrayList<String>();
         LruCache<String, String> cache = newRemovalLogCache(log);
@@ -310,6 +335,7 @@ public final class LruCacheTest extends TestCase {
         assertEquals(Arrays.asList("a=A", "b=B", "c=C"), log);
     }
 
+    @Test
     public void testEvictAllEvictsSizeZeroElements() {
         LruCache<String, String> cache = new LruCache<String, String>(10) {
             @Override protected int sizeOf(String key, String value) {
@@ -323,6 +349,7 @@ public final class LruCacheTest extends TestCase {
         assertSnapshot(cache);
     }
 
+    @Test
     public void testRemoveWithCustomSizes() {
         LruCache<String, String> cache = new LruCache<String, String>(10) {
             @Override protected int sizeOf(String key, String value) {
@@ -335,6 +362,7 @@ public final class LruCacheTest extends TestCase {
         assertEquals(4, cache.size());
     }
 
+    @Test
     public void testRemoveAbsentElement() {
         LruCache<String, String> cache = new LruCache<String, String>(10);
         cache.put("a", "A");
@@ -343,6 +371,7 @@ public final class LruCacheTest extends TestCase {
         assertEquals(2, cache.size());
     }
 
+    @Test
     public void testRemoveNullThrows() {
         LruCache<String, String> cache = new LruCache<String, String>(10);
         try {
@@ -352,6 +381,7 @@ public final class LruCacheTest extends TestCase {
         }
     }
 
+    @Test
     public void testRemoveCallsEntryRemoved() {
         List<String> log = new ArrayList<String>();
         LruCache<String, String> cache = newRemovalLogCache(log);
@@ -360,6 +390,7 @@ public final class LruCacheTest extends TestCase {
         assertEquals(Arrays.asList("a=A>null"), log);
     }
 
+    @Test
     public void testPutCallsEntryRemoved() {
         List<String> log = new ArrayList<String>();
         LruCache<String, String> cache = newRemovalLogCache(log);
@@ -368,6 +399,7 @@ public final class LruCacheTest extends TestCase {
         assertEquals(Arrays.asList("a=A>A2"), log);
     }
 
+    @Test
     public void testEntryRemovedIsCalledWithoutSynchronization() {
         LruCache<String, String> cache = new LruCache<String, String>(3) {
             @Override protected void entryRemoved(
@@ -385,6 +417,7 @@ public final class LruCacheTest extends TestCase {
         cache.evictAll();     // multiple eviction
     }
 
+    @Test
     public void testCreateIsCalledWithoutSynchronization() {
         LruCache<String, String> cache = new LruCache<String, String>(3) {
             @Override protected String create(String key) {
@@ -401,6 +434,7 @@ public final class LruCacheTest extends TestCase {
      * working. The map value should be returned by get(), and the created value
      * should be released with entryRemoved().
      */
+    @Test
     public void testCreateWithConcurrentPut() {
         final List<String> log = new ArrayList<String>();
         LruCache<String, String> cache = new LruCache<String, String>(3) {
@@ -423,6 +457,7 @@ public final class LruCacheTest extends TestCase {
      * the first create to return is returned by both gets. The other created
      * values should be released with entryRemove().
      */
+    @Test
     public void testCreateWithConcurrentCreate() {
         final List<String> log = new ArrayList<String>();
         LruCache<String, Integer> cache = new LruCache<String, Integer>(3) {
diff --git a/core/tests/coretests/src/android/util/MonthDisplayHelperTest.java b/core/tests/coretests/src/android/util/MonthDisplayHelperTest.java
index 30d5f778e945..06f970fcf77c 100644
--- a/core/tests/coretests/src/android/util/MonthDisplayHelperTest.java
+++ b/core/tests/coretests/src/android/util/MonthDisplayHelperTest.java
@@ -16,18 +16,26 @@
 
 package android.util;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
-import junit.framework.TestCase;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.Calendar;
 
 /**
  * Unit tests for {@link MonthDisplayHelper}.
  */
-public class MonthDisplayHelperTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class MonthDisplayHelperTest {
 
 
+    @Test
     @SmallTest
     public void testFirstDayOfMonth() {
 
@@ -40,12 +48,14 @@ public class MonthDisplayHelperTest extends TestCase {
                 new MonthDisplayHelper(2007, Calendar.SEPTEMBER).getFirstDayOfMonth());
     }
 
+    @Test
     @SmallTest
     public void testNumberOfDaysInCurrentMonth() {
         assertEquals(30,
                 new MonthDisplayHelper(2007, Calendar.SEPTEMBER).getNumberOfDaysInMonth());
     }
 
+    @Test
     @SmallTest
     public void testMonthRows() {
         MonthDisplayHelper helper = new MonthDisplayHelper(2007, Calendar.SEPTEMBER);
@@ -59,6 +69,7 @@ public class MonthDisplayHelperTest extends TestCase {
 
     }
 
+    @Test
     @SmallTest
     public void testMonthRowsWeekStartsMonday() {
         MonthDisplayHelper helper = new MonthDisplayHelper(2007,
@@ -74,6 +85,7 @@ public class MonthDisplayHelperTest extends TestCase {
                 helper.getDigitsForRow(5));
     }
 
+    @Test
     @SmallTest
     public void testMonthRowsWeekStartsSaturday() {
         MonthDisplayHelper helper = new MonthDisplayHelper(2007,
@@ -98,6 +110,7 @@ public class MonthDisplayHelperTest extends TestCase {
                 helper.getDigitsForRow(4));
     }
 
+    @Test
     @SmallTest
     public void testGetDayAt() {
         MonthDisplayHelper helper = new MonthDisplayHelper(2007,
@@ -109,6 +122,7 @@ public class MonthDisplayHelperTest extends TestCase {
         assertEquals(2, helper.getDayAt(5, 2));
     }
 
+    @Test
     @SmallTest
     public void testPrevMonth() {
         MonthDisplayHelper helper = new MonthDisplayHelper(2007,
@@ -124,6 +138,7 @@ public class MonthDisplayHelperTest extends TestCase {
                 helper.getDigitsForRow(0));
     }
 
+    @Test
     @SmallTest
     public void testPrevMonthRollOver() {
         MonthDisplayHelper helper = new MonthDisplayHelper(2007,
@@ -135,6 +150,7 @@ public class MonthDisplayHelperTest extends TestCase {
         assertEquals(Calendar.DECEMBER, helper.getMonth());
     }
 
+    @Test
     @SmallTest
     public void testNextMonth() {
         MonthDisplayHelper helper = new MonthDisplayHelper(2007,
@@ -150,6 +166,7 @@ public class MonthDisplayHelperTest extends TestCase {
                 helper.getDigitsForRow(0));
     }
 
+    @Test
     @SmallTest
     public void testGetRowOf() {
         MonthDisplayHelper helper = new MonthDisplayHelper(2007,
@@ -162,6 +179,7 @@ public class MonthDisplayHelperTest extends TestCase {
         assertEquals(3, helper.getRowOf(19));
     }
 
+    @Test
     @SmallTest
     public void testGetColumnOf() {
         MonthDisplayHelper helper = new MonthDisplayHelper(2007,
@@ -174,6 +192,7 @@ public class MonthDisplayHelperTest extends TestCase {
         assertEquals(0, helper.getColumnOf(26));
     }
 
+    @Test
     @SmallTest
     public void testWithinCurrentMonth() {
         MonthDisplayHelper helper = new MonthDisplayHelper(2007,
diff --git a/core/tests/coretests/src/android/util/NtpTrustedTimeTest.java b/core/tests/coretests/src/android/util/NtpTrustedTimeTest.java
index 4de27c332d96..ce1eabc741a3 100644
--- a/core/tests/coretests/src/android/util/NtpTrustedTimeTest.java
+++ b/core/tests/coretests/src/android/util/NtpTrustedTimeTest.java
@@ -31,10 +31,15 @@ import static java.lang.String.join;
 import static java.util.Arrays.asList;
 
 import android.net.Network;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.SmallTest;
+import androidx.test.platform.app.InstrumentationRegistry;
 
+import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.InOrder;
@@ -51,7 +56,10 @@ import java.util.stream.Stream;
 
 @SmallTest
 @RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = NtpTrustedTime.class)
 public class NtpTrustedTimeTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
 
     private static final Duration VALID_TIMEOUT = Duration.ofSeconds(5);
 
diff --git a/core/tests/coretests/src/android/util/PatternsTest.java b/core/tests/coretests/src/android/util/PatternsTest.java
index dd8f73fd54c4..a180ec3f9e35 100644
--- a/core/tests/coretests/src/android/util/PatternsTest.java
+++ b/core/tests/coretests/src/android/util/PatternsTest.java
@@ -16,17 +16,25 @@
 
 package android.util;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
-import junit.framework.TestCase;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-public class PatternsTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class PatternsTest {
 
     // Tests for Patterns.TOP_LEVEL_DOMAIN
 
+    @Test
     @SmallTest
     public void testTldPattern() throws Exception {
         boolean t;
@@ -58,36 +66,42 @@ public class PatternsTest extends TestCase {
 
     // Tests for Patterns.IANA_TOP_LEVEL_DOMAINS
 
+    @Test
     @SmallTest
     public void testIanaTopLevelDomains_matchesValidTld() throws Exception {
         Pattern pattern = Pattern.compile(Patterns.IANA_TOP_LEVEL_DOMAINS);
         assertTrue("Should match 'com'", pattern.matcher("com").matches());
     }
 
+    @Test
     @SmallTest
     public void testIanaTopLevelDomains_matchesValidNewTld() throws Exception {
         Pattern pattern = Pattern.compile(Patterns.IANA_TOP_LEVEL_DOMAINS);
         assertTrue("Should match 'me'", pattern.matcher("me").matches());
     }
 
+    @Test
     @SmallTest
     public void testIanaTopLevelDomains_matchesPunycodeTld() throws Exception {
         Pattern pattern = Pattern.compile(Patterns.IANA_TOP_LEVEL_DOMAINS);
         assertTrue("Should match Punycode TLD", pattern.matcher("xn--qxam").matches());
     }
 
+    @Test
     @SmallTest
     public void testIanaTopLevelDomains_matchesIriTLD() throws Exception {
         Pattern pattern = Pattern.compile(Patterns.IANA_TOP_LEVEL_DOMAINS);
         assertTrue("Should match IRI TLD", pattern.matcher("\uD55C\uAD6D").matches());
     }
 
+    @Test
     @SmallTest
     public void testIanaTopLevelDomains_doesNotMatchWrongTld() throws Exception {
         Pattern pattern = Pattern.compile(Patterns.IANA_TOP_LEVEL_DOMAINS);
         assertFalse("Should not match 'mem'", pattern.matcher("mem").matches());
     }
 
+    @Test
     @SmallTest
     public void testIanaTopLevelDomains_doesNotMatchWrongPunycodeTld() throws Exception {
         Pattern pattern = Pattern.compile(Patterns.IANA_TOP_LEVEL_DOMAINS);
@@ -96,6 +110,7 @@ public class PatternsTest extends TestCase {
 
     // Tests for Patterns.WEB_URL
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesValidUrlWithSchemeAndHostname() throws Exception {
         String url = "http://www.android.com";
@@ -103,6 +118,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesValidUrlWithSchemeHostnameAndNewTld() throws Exception {
         String url = "http://www.android.me";
@@ -110,6 +126,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesValidUrlWithHostnameAndNewTld() throws Exception {
         String url = "android.me";
@@ -117,6 +134,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesChinesePunycodeUrlWithProtocol() throws Exception {
         String url = "http://xn--fsqu00a.xn--0zwm56d";
@@ -124,6 +142,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesChinesePunycodeUrlWithoutProtocol() throws Exception {
         String url = "xn--fsqu00a.xn--0zwm56d";
@@ -131,6 +150,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesArabicPunycodeUrlWithProtocol() throws Exception {
         String url = "http://xn--4gbrim.xn----rmckbbajlc6dj7bxne2c.xn--wgbh1c/ar/default.aspx";
@@ -138,6 +158,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesArabicPunycodeUrlWithoutProtocol() throws Exception {
         String url = "xn--4gbrim.xn----rmckbbajlc6dj7bxne2c.xn--wgbh1c/ar/default.aspx";
@@ -145,6 +166,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesUrlWithUnicodeDomainNameWithProtocol() throws Exception {
         String url = "http://\uD604\uAE08\uC601\uC218\uC99D.kr";
@@ -152,6 +174,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesUrlWithUnicodeDomainNameWithoutProtocol() throws Exception {
         String url = "\uD604\uAE08\uC601\uC218\uC99D.kr";
@@ -159,6 +182,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesUrlWithUnicodeTld() throws Exception {
         String url = "\uB3C4\uBA54\uC778.\uD55C\uAD6D";
@@ -166,6 +190,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesUrlWithUnicodePath() throws Exception {
         String url = "http://brainstormtech.blogs.fortune.cnn.com/2010/03/11/" +
@@ -174,19 +199,22 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_doesNotMatchValidUrlWithInvalidProtocol() throws Exception {
-        String url = "ftp://www.example.com";
+        String url = "invalid://www.example.com";
         assertFalse("Should not match URL with invalid protocol",
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesValidUrlWithPort() throws Exception {
         String url = "http://www.example.com:8080";
         assertTrue("Should match URL with port", Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesUrlWithPortAndQuery() throws Exception {
         String url = "http://www.example.com:8080/?foo=bar";
@@ -194,12 +222,14 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesUrlWithTilde() throws Exception {
         String url = "http://www.example.com:8080/~user/?foo=bar";
         assertTrue("Should match URL with tilde", Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesProtocolCaseInsensitive() throws Exception {
         String url = "hTtP://android.com";
@@ -207,6 +237,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesDomainNameWithDash() throws Exception {
         String url = "http://a-nd.r-oid.com";
@@ -218,6 +249,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesDomainNameWithUnderscore() throws Exception {
         String url = "http://a_nd.r_oid.com";
@@ -229,6 +261,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesPathAndQueryWithDollarSign() throws Exception {
         String url = "http://android.com/path$?v=$val";
@@ -240,6 +273,7 @@ public class PatternsTest extends TestCase {
                 Patterns.WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testWebUrl_matchesEmptyPathWithQueryParams() throws Exception {
         String url = "http://android.com?q=v";
@@ -261,6 +295,7 @@ public class PatternsTest extends TestCase {
 
     // Tests for Patterns.AUTOLINK_WEB_URL
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesValidUrlWithSchemeAndHostname() throws Exception {
         String url = "http://www.android.com";
@@ -268,6 +303,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesValidUrlWithSchemeHostnameAndNewTld() throws Exception {
         String url = "http://www.android.me";
@@ -275,6 +311,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesValidUrlWithHostnameAndNewTld() throws Exception {
         String url = "android.me";
@@ -286,6 +323,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesChinesePunycodeUrlWithProtocol() throws Exception {
         String url = "http://xn--fsqu00a.xn--0zwm56d";
@@ -293,6 +331,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesChinesePunycodeUrlWithoutProtocol() throws Exception {
         String url = "xn--fsqu00a.xn--0zwm56d";
@@ -300,6 +339,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesArabicPunycodeUrlWithProtocol() throws Exception {
         String url = "http://xn--4gbrim.xn--rmckbbajlc6dj7bxne2c.xn--wgbh1c/ar/default.aspx";
@@ -307,6 +347,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesArabicPunycodeUrlWithoutProtocol() throws Exception {
         String url = "xn--4gbrim.xn--rmckbbajlc6dj7bxne2c.xn--wgbh1c/ar/default.aspx";
@@ -314,6 +355,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_doesNotMatchPunycodeTldThatStartsWithDash() throws Exception {
         String url = "http://xn--fsqu00a.-xn--0zwm56d";
@@ -321,6 +363,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_doesNotMatchPunycodeTldThatEndsWithDash() throws Exception {
         String url = "http://xn--fsqu00a.xn--0zwm56d-";
@@ -328,6 +371,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesUrlWithUnicodeDomainName() throws Exception {
         String url = "http://\uD604\uAE08\uC601\uC218\uC99D.kr";
@@ -339,6 +383,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesUrlWithUnicodeTld() throws Exception {
         String url = "\uB3C4\uBA54\uC778.\uD55C\uAD6D";
@@ -346,6 +391,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesUrlWithUnicodePath() throws Exception {
         String url = "http://brainstormtech.blogs.fortune.cnn.com/2010/03/11/" +
@@ -354,13 +400,15 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_doesNotMatchValidUrlWithInvalidProtocol() throws Exception {
-        String url = "ftp://www.example.com";
+        String url = "invalid://www.example.com";
         assertFalse("Should not match URL with invalid protocol",
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesValidUrlWithPort() throws Exception {
         String url = "http://www.example.com:8080";
@@ -368,6 +416,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesUrlWithPortAndQuery() throws Exception {
         String url = "http://www.example.com:8080/?foo=bar";
@@ -375,6 +424,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesUrlWithTilde() throws Exception {
         String url = "http://www.example.com:8080/~user/?foo=bar";
@@ -382,6 +432,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesProtocolCaseInsensitive() throws Exception {
         String url = "hTtP://android.com";
@@ -389,6 +440,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesUrlStartingWithHttpAndDoesNotHaveTld() throws Exception {
         String url = "http://android/#notld///a/n/d/r/o/i/d&p1=1&p2=2";
@@ -396,6 +448,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_doesNotMatchUrlsWithoutProtocolAndWithUnknownTld()
             throws Exception {
@@ -405,13 +458,15 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_doesNotPartiallyMatchUnknownProtocol() throws Exception {
-        String url = "ftp://foo.bar/baz";
+        String url = "invalid://foo.bar/baz";
         assertFalse("Should not partially match URL with unknown protocol",
                 Patterns.AUTOLINK_WEB_URL.matcher(url).find());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesValidUrlWithEmoji() throws Exception {
         String url = "Thank\u263A.com";
@@ -419,6 +474,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_doesNotMatchUrlsWithEmojiWithoutProtocolAndWithoutKnownTld()
             throws Exception {
@@ -427,6 +483,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_doesNotMatchEmailAddress()
             throws Exception {
@@ -435,6 +492,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesDomainNameWithSurrogatePairs() throws Exception {
         String url = "android\uD83C\uDF38.com";
@@ -442,6 +500,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesTldWithSurrogatePairs() throws Exception {
         String url = "http://android.\uD83C\uDF38com";
@@ -449,6 +508,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesPathWithSurrogatePairs() throws Exception {
         String url = "http://android.com/path-with-\uD83C\uDF38?v=\uD83C\uDF38";
@@ -456,6 +516,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_doesNotMatchUrlWithExcludedSurrogate() throws Exception {
         String url = "http://android\uD83F\uDFFE.com";
@@ -463,6 +524,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_doesNotMatchUnicodeSpaces() throws Exception {
         String part1 = "http://and";
@@ -493,6 +555,7 @@ public class PatternsTest extends TestCase {
         }
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesDomainNameWithDash() throws Exception {
         String url = "http://a-nd.r-oid.com";
@@ -504,6 +567,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesDomainNameWithUnderscore() throws Exception {
         String url = "http://a_nd.r_oid.com";
@@ -515,6 +579,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesPathAndQueryWithDollarSign() throws Exception {
         String url = "http://android.com/path$?v=$val";
@@ -526,6 +591,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkWebUrl_matchesEmptyPathWithQueryParams() throws Exception {
         String url = "http://android.com?q=v";
@@ -547,6 +613,7 @@ public class PatternsTest extends TestCase {
 
     // Tests for Patterns.IP_ADDRESS
 
+    @Test
     @SmallTest
     public void testIpPattern() throws Exception {
         boolean t;
@@ -560,6 +627,7 @@ public class PatternsTest extends TestCase {
 
     // Tests for Patterns.DOMAIN_NAME
 
+    @Test
     @SmallTest
     public void testDomain_matchesPunycodeTld() throws Exception {
         String domain = "xn--fsqu00a.xn--0zwm56d";
@@ -567,6 +635,7 @@ public class PatternsTest extends TestCase {
                 Patterns.DOMAIN_NAME.matcher(domain).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_doesNotMatchPunycodeThatStartsWithDash() throws Exception {
         String domain = "xn--fsqu00a.-xn--0zwm56d";
@@ -574,6 +643,7 @@ public class PatternsTest extends TestCase {
                 Patterns.DOMAIN_NAME.matcher(domain).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_doesNotMatchPunycodeThatEndsWithDash() throws Exception {
         String domain = "xn--fsqu00a.xn--0zwm56d-";
@@ -581,6 +651,7 @@ public class PatternsTest extends TestCase {
                 Patterns.DOMAIN_NAME.matcher(domain).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_doesNotMatchPunycodeLongerThanAllowed() throws Exception {
         String tld = "xn--";
@@ -592,6 +663,7 @@ public class PatternsTest extends TestCase {
                 Patterns.DOMAIN_NAME.matcher(domain).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_matchesObsoleteTld() throws Exception {
         String domain = "test.yu";
@@ -599,6 +671,7 @@ public class PatternsTest extends TestCase {
                 Patterns.DOMAIN_NAME.matcher(domain).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_matchesWithSubDomain() throws Exception {
         String domain = "mail.example.com";
@@ -606,6 +679,7 @@ public class PatternsTest extends TestCase {
                 Patterns.DOMAIN_NAME.matcher(domain).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_matchesWithoutSubDomain() throws Exception {
         String domain = "android.me";
@@ -613,6 +687,7 @@ public class PatternsTest extends TestCase {
                 Patterns.DOMAIN_NAME.matcher(domain).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_matchesUnicodeDomainNames() throws Exception {
         String domain = "\uD604\uAE08\uC601\uC218\uC99D.kr";
@@ -620,6 +695,7 @@ public class PatternsTest extends TestCase {
                 Patterns.DOMAIN_NAME.matcher(domain).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_doesNotMatchInvalidDomain() throws Exception {
         String domain = "__+&42.xer";
@@ -627,6 +703,7 @@ public class PatternsTest extends TestCase {
                 Patterns.DOMAIN_NAME.matcher(domain).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_matchesPunycodeArabicDomainName() throws Exception {
         String domain = "xn--4gbrim.xn----rmckbbajlc6dj7bxne2c.xn--wgbh1c";
@@ -634,6 +711,7 @@ public class PatternsTest extends TestCase {
                 Patterns.DOMAIN_NAME.matcher(domain).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_matchesDomainNameWithDash() throws Exception {
         String url = "http://a-nd.r-oid.com";
@@ -645,6 +723,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_WEB_URL.matcher(url).matches());
     }
 
+    @Test
     @SmallTest
     public void testDomain_matchesDomainNameWithUnderscore() throws Exception {
         String url = "http://a_nd.r_oid.com";
@@ -658,6 +737,7 @@ public class PatternsTest extends TestCase {
 
     // Tests for Patterns.AUTOLINK_EMAIL_ADDRESS
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesShortValidEmail() throws Exception {
         String email = "a@a.co";
@@ -665,6 +745,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesRegularEmail() throws Exception {
         String email = "email@android.com";
@@ -672,6 +753,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesEmailWithMultipleSubdomains() throws Exception {
         String email = "email@e.somelongdomainnameforandroid.abc.uk";
@@ -679,6 +761,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesLocalPartWithDot() throws Exception {
         String email = "e.mail@android.com";
@@ -686,6 +769,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesLocalPartWithPlus() throws Exception {
         String email = "e+mail@android.com";
@@ -693,6 +777,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesLocalPartWithUnderscore() throws Exception {
         String email = "e_mail@android.com";
@@ -700,6 +785,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesLocalPartWithDash() throws Exception {
         String email = "e-mail@android.com";
@@ -707,6 +793,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesLocalPartWithApostrophe() throws Exception {
         String email = "e'mail@android.com";
@@ -714,6 +801,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesLocalPartWithDigits() throws Exception {
         String email = "123@android.com";
@@ -721,6 +809,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesUnicodeLocalPart() throws Exception {
         String email = "\uD604\uAE08\uC601\uC218\uC99D@android.kr";
@@ -728,6 +817,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesLocalPartWithEmoji() throws Exception {
         String email = "smiley\u263A@android.com";
@@ -735,6 +825,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesLocalPartWithSurrogatePairs() throws Exception {
         String email = "\uD83C\uDF38@android.com";
@@ -742,6 +833,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesDomainWithDash() throws Exception {
         String email = "email@an-droid.com";
@@ -749,6 +841,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesUnicodeDomain() throws Exception {
         String email = "email@\uD604\uAE08\uC601\uC218\uC99D.kr";
@@ -756,6 +849,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesUnicodeLocalPartAndDomain() throws Exception {
         String email = "\uD604\uAE08\uC601\uC218\uC99D@\uD604\uAE08\uC601\uC218\uC99D.kr";
@@ -763,6 +857,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesDomainWithEmoji() throws Exception {
         String email = "smiley@\u263Aandroid.com";
@@ -770,6 +865,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesDomainWithSurrogatePairs() throws Exception {
         String email = "email@\uD83C\uDF38android.com";
@@ -777,6 +873,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesLocalPartAndDomainWithSurrogatePairs()
             throws Exception {
@@ -785,6 +882,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_doesNotMatchStringWithoutAtSign() throws Exception {
         String email = "android.com";
@@ -792,6 +890,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_doesNotMatchPlainString() throws Exception {
         String email = "email";
@@ -799,6 +898,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_doesNotMatchStringWithMultipleAtSigns() throws Exception {
         String email = "email@android@android.com";
@@ -806,6 +906,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_doesNotMatchEmailWithoutTld() throws Exception {
         String email = "email@android";
@@ -813,6 +914,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_doesNotMatchLocalPartEndingWithDot() throws Exception {
         String email = "email.@android.com";
@@ -820,6 +922,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_doesNotMatchLocalPartStartingWithDot() throws Exception {
         String email = ".email@android.com";
@@ -827,6 +930,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_doesNotMatchDomainStartingWithDash() throws Exception {
         String email = "email@-android.com";
@@ -834,6 +938,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_doesNotMatchDomainWithConsecutiveDots() throws Exception {
         String email = "email@android..com";
@@ -841,6 +946,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_doesNotMatchEmailWithIpAsDomain() throws Exception {
         String email = "email@127.0.0.1";
@@ -848,6 +954,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_doesNotMatchEmailWithInvalidTld() throws Exception {
         String email = "email@android.c";
@@ -855,6 +962,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesLocalPartUpTo64Chars() throws Exception {
         String localPart = "";
@@ -871,6 +979,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesSubdomainUpTo63Chars() throws Exception {
         String subdomain = "";
@@ -888,6 +997,7 @@ public class PatternsTest extends TestCase {
                 Patterns.AUTOLINK_EMAIL_ADDRESS.matcher(email).matches());
     }
 
+    @Test
     @SmallTest
     public void testAutoLinkEmailAddress_matchesDomainUpTo255Chars() throws Exception {
         String longDomain = "";
@@ -909,6 +1019,7 @@ public class PatternsTest extends TestCase {
 
     // Tests for Patterns.PHONE
 
+    @Test
     @SmallTest
     public void testPhonePattern() throws Exception {
         boolean t;
diff --git a/core/tests/coretests/src/android/util/RecurrenceRuleTest.java b/core/tests/coretests/src/android/util/RecurrenceRuleTest.java
index caa12083fafb..32548b4cff19 100644
--- a/core/tests/coretests/src/android/util/RecurrenceRuleTest.java
+++ b/core/tests/coretests/src/android/util/RecurrenceRuleTest.java
@@ -16,9 +16,17 @@
 
 package android.util;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
-import junit.framework.TestCase;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.time.Clock;
 import java.time.Instant;
@@ -28,19 +36,18 @@ import java.time.ZonedDateTime;
 import java.util.Iterator;
 
 @SmallTest
-public class RecurrenceRuleTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class RecurrenceRuleTest {
 
     static Clock sOriginalClock;
 
-    @Override
-    protected void setUp() throws Exception {
-        super.setUp();
+    @Before
+    public void setUp() throws Exception {
         sOriginalClock = RecurrenceRule.sClock;
     }
 
-    @Override
-    protected void tearDown() throws Exception {
-        super.tearDown();
+    @After
+    public void tearDown() throws Exception {
         RecurrenceRule.sClock = sOriginalClock;
     }
 
@@ -48,6 +55,7 @@ public class RecurrenceRuleTest extends TestCase {
         RecurrenceRule.sClock = Clock.fixed(instant, ZoneId.systemDefault());
     }
 
+    @Test
     public void testSimpleMonth() throws Exception {
         setClock(Instant.parse("2015-11-20T10:15:30.00Z"));
         final RecurrenceRule r = new RecurrenceRule(
@@ -68,6 +76,7 @@ public class RecurrenceRuleTest extends TestCase {
                 ZonedDateTime.parse("2015-11-14T00:00:00.00Z")), it.next());
     }
 
+    @Test
     public void testSimpleDays() throws Exception {
         setClock(Instant.parse("2015-01-01T10:15:30.00Z"));
         final RecurrenceRule r = new RecurrenceRule(
@@ -89,6 +98,7 @@ public class RecurrenceRuleTest extends TestCase {
         assertFalse(it.hasNext());
     }
 
+    @Test
     public void testNotRecurring() throws Exception {
         setClock(Instant.parse("2015-01-01T10:15:30.00Z"));
         final RecurrenceRule r = new RecurrenceRule(
@@ -106,6 +116,7 @@ public class RecurrenceRuleTest extends TestCase {
         assertFalse(it.hasNext());
     }
 
+    @Test
     public void testNever() throws Exception {
         setClock(Instant.parse("2015-01-01T10:15:30.00Z"));
         final RecurrenceRule r = RecurrenceRule.buildNever();
@@ -116,6 +127,7 @@ public class RecurrenceRuleTest extends TestCase {
         assertFalse(it.hasNext());
     }
 
+    @Test
     public void testSane() throws Exception {
         final RecurrenceRule r = new RecurrenceRule(
                 ZonedDateTime.parse("1980-01-31T00:00:00.000Z"),
diff --git a/core/tests/coretests/src/android/util/SparseSetArrayTest.java b/core/tests/coretests/src/android/util/SparseSetArrayTest.java
index 3c17486aeb94..1df1090e0343 100644
--- a/core/tests/coretests/src/android/util/SparseSetArrayTest.java
+++ b/core/tests/coretests/src/android/util/SparseSetArrayTest.java
@@ -17,9 +17,13 @@ package android.util;
 
 import static com.google.common.truth.Truth.assertThat;
 
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
+
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -29,6 +33,9 @@ import org.junit.runner.RunWith;
 @SmallTest
 @RunWith(AndroidJUnit4.class)
 public class SparseSetArrayTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     @Test
     public void testAddAll() {
         final SparseSetArray<Integer> sparseSetArray = new SparseSetArray<>();
@@ -51,6 +58,7 @@ public class SparseSetArrayTest {
     }
 
     @Test
+    @IgnoreUnderRavenwood(reason = "b/315036461")
     public void testCopyConstructor() {
         final SparseSetArray<Integer> sparseSetArray = new SparseSetArray<>();
 
diff --git a/core/tests/coretests/src/android/util/StateSetTest.java b/core/tests/coretests/src/android/util/StateSetTest.java
index b5d62704ba29..dfd1523465ae 100644
--- a/core/tests/coretests/src/android/util/StateSetTest.java
+++ b/core/tests/coretests/src/android/util/StateSetTest.java
@@ -16,16 +16,29 @@
 
 package android.util;
 
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
+
 import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
-import junit.framework.TestCase;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 /**
  * Tests for {@link StateSet}
  */
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = StateSet.class)
+public class StateSetTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
 
-public class StateSetTest extends TestCase {
-    
+    @Test
     @SmallTest
     public void testStateSetPositiveMatches() throws Exception {
          int[] stateSpec = new int[2];
@@ -48,6 +61,7 @@ public class StateSetTest extends TestCase {
          assertTrue(StateSet.stateSetMatches(stateSpec, stateSet));
      }
 
+     @Test
      @SmallTest
      public void testStatesSetMatchMixEmUp() throws Exception {
          int[] stateSpec = new int[2];
@@ -70,6 +84,7 @@ public class StateSetTest extends TestCase {
          assertTrue(StateSet.stateSetMatches(stateSpec, stateSet));
      }
 
+     @Test
      @SmallTest
      public void testStateSetNegativeMatches() throws Exception {
          int[] stateSpec = new int[2];
@@ -92,6 +107,7 @@ public class StateSetTest extends TestCase {
          assertFalse(StateSet.stateSetMatches(stateSpec, stateSet));
      }
 
+     @Test
      @SmallTest
      public void testEmptySetMatchesNegtives() throws Exception {
          int[] stateSpec = {-12345, -6789};
@@ -101,6 +117,7 @@ public class StateSetTest extends TestCase {
          assertTrue(StateSet.stateSetMatches(stateSpec, stateSet2));
      }
 
+     @Test
      @SmallTest
      public void testEmptySetFailsPositives() throws Exception {
          int[] stateSpec = {12345};
@@ -110,6 +127,7 @@ public class StateSetTest extends TestCase {
          assertFalse(StateSet.stateSetMatches(stateSpec, stateSet2));
      }
 
+     @Test
      @SmallTest
      public void testEmptySetMatchesWildcard() throws Exception {
          int[] stateSpec = StateSet.WILD_CARD;
@@ -119,6 +137,7 @@ public class StateSetTest extends TestCase {
          assertTrue(StateSet.stateSetMatches(stateSpec, stateSet2));
      }
 
+     @Test
      @SmallTest
      public void testSingleStatePositiveMatches() throws Exception {
          int[] stateSpec = new int[2];
@@ -135,6 +154,7 @@ public class StateSetTest extends TestCase {
          assertFalse(StateSet.stateSetMatches(stateSpec, state));
      }
 
+     @Test
      @SmallTest
      public void testSingleStateNegativeMatches() throws Exception {
          int[] stateSpec = new int[2];
@@ -151,6 +171,7 @@ public class StateSetTest extends TestCase {
          assertTrue(StateSet.stateSetMatches(stateSpec, state));
      }
 
+     @Test
      @SmallTest
      public void testZeroStateOnlyMatchesDefault() throws Exception {
          int[] stateSpec = new int[3];
@@ -166,6 +187,7 @@ public class StateSetTest extends TestCase {
          assertTrue(StateSet.stateSetMatches(stateSpec, state));
      }
 
+     @Test
      @SmallTest
      public void testNullStateOnlyMatchesDefault() throws Exception {
          int[] stateSpec = new int[3];
diff --git a/core/tests/coretests/src/android/util/apk/SourceStampVerifierTest.java b/core/tests/coretests/src/android/util/apk/SourceStampVerifierTest.java
index e0c583ddc978..48e76f79a928 100644
--- a/core/tests/coretests/src/android/util/apk/SourceStampVerifierTest.java
+++ b/core/tests/coretests/src/android/util/apk/SourceStampVerifierTest.java
@@ -26,12 +26,16 @@ import static org.junit.Assert.assertTrue;
 import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
 
 import android.content.Context;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 
 import androidx.test.core.app.ApplicationProvider;
 
 import libcore.io.Streams;
 
 import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -48,13 +52,21 @@ import java.util.zip.ZipFile;
 
 /** Unit test for {@link android.util.apk.SourceStampVerifier} */
 @RunWith(JUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = SourceStampVerifier.class)
 public class SourceStampVerifierTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
 
-    private final Context mContext = ApplicationProvider.getApplicationContext();
+    private Context mContext;
 
     private File mPrimaryApk;
     private File mSecondaryApk;
 
+    @Before
+    public void setUp() throws Exception {
+        mContext = ApplicationProvider.getApplicationContext();
+    }
+
     @After
     public void tearDown() throws Exception {
         if (mPrimaryApk != null) {
diff --git a/core/tests/coretests/src/android/view/menu/MenuScenario.java b/core/tests/coretests/src/android/view/menu/MenuScenario.java
index 668aec4eb18f..a1615afe4fa3 100644
--- a/core/tests/coretests/src/android/view/menu/MenuScenario.java
+++ b/core/tests/coretests/src/android/view/menu/MenuScenario.java
@@ -18,7 +18,7 @@ package android.view.menu;
 
 import android.app.Activity;
 import android.os.Bundle;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.util.SparseArray;
 import android.view.Menu;
 import android.view.MenuItem;
diff --git a/core/tests/coretests/src/android/util/GridScenario.java b/core/tests/coretests/src/android/widget/GridScenario.java
index e7ee1cd59c7c..d74080863895 100644
--- a/core/tests/coretests/src/android/util/GridScenario.java
+++ b/core/tests/coretests/src/android/widget/GridScenario.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2007 The Android Open Source Project
+ * Copyright (C) 2023 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package android.util;
+package android.widget;
 
 import android.app.Activity;
 import android.os.Bundle;
diff --git a/core/tests/coretests/src/android/util/InternalSelectionView.java b/core/tests/coretests/src/android/widget/InternalSelectionView.java
index 4a1baef8077a..f2d318226540 100644
--- a/core/tests/coretests/src/android/util/InternalSelectionView.java
+++ b/core/tests/coretests/src/android/widget/InternalSelectionView.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2007 The Android Open Source Project
+ * Copyright (C) 2023 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package android.util;
+package android.widget;
 
 import android.content.Context;
 import android.content.res.TypedArray;
@@ -22,6 +22,7 @@ import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Rect;
+import android.util.AttributeSet;
 import android.view.KeyEvent;
 import android.view.View;
 
diff --git a/core/tests/coretests/src/android/util/ListScenario.java b/core/tests/coretests/src/android/widget/ListScenario.java
index 74dc4b4b34a1..589d90d82285 100644
--- a/core/tests/coretests/src/android/util/ListScenario.java
+++ b/core/tests/coretests/src/android/widget/ListScenario.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2007 The Android Open Source Project
+ * Copyright (C) 2023 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,20 +14,15 @@
  * limitations under the License.
  */
 
-package android.util;
+package android.widget;
 
 import android.app.Activity;
 import android.graphics.Rect;
 import android.os.Bundle;
+import android.util.ListItemFactory;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.Window;
-import android.widget.AdapterView;
-import android.widget.BaseAdapter;
-import android.widget.EditText;
-import android.widget.LinearLayout;
-import android.widget.ListView;
-import android.widget.TextView;
 
 import com.google.android.collect.Maps;
 
diff --git a/core/tests/coretests/src/android/util/ScrollViewScenario.java b/core/tests/coretests/src/android/widget/ScrollViewScenario.java
index ab1a642a9327..ff2ab05d645f 100644
--- a/core/tests/coretests/src/android/util/ScrollViewScenario.java
+++ b/core/tests/coretests/src/android/widget/ScrollViewScenario.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008 The Android Open Source Project
+ * Copyright (C) 2023 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package android.util;
+package android.widget;
 
 import android.app.Activity;
 import android.content.Context;
@@ -23,6 +23,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.Window;
 import android.widget.Button;
+import android.widget.InternalSelectionView;
 import android.widget.LinearLayout;
 import android.widget.ScrollView;
 import android.widget.TextView;
diff --git a/core/tests/coretests/src/android/widget/focus/AdjacentVerticalRectLists.java b/core/tests/coretests/src/android/widget/focus/AdjacentVerticalRectLists.java
index 85a4509c18a3..7e2f293b3a99 100644
--- a/core/tests/coretests/src/android/widget/focus/AdjacentVerticalRectLists.java
+++ b/core/tests/coretests/src/android/widget/focus/AdjacentVerticalRectLists.java
@@ -18,7 +18,7 @@ package android.widget.focus;
 
 import android.app.Activity;
 import android.os.Bundle;
-import android.util.InternalSelectionView;
+import android.widget.InternalSelectionView;
 import android.view.ViewGroup;
 import android.widget.LinearLayout;
 
@@ -30,7 +30,7 @@ import android.widget.LinearLayout;
  * rectangle of the previously focused view.  The view taking focus can use this
  * to set an internal selection more appropriate using this rect.
  *
- * This Activity excercises that behavior using three adjacent {@link android.util.InternalSelectionView}
+ * This Activity excercises that behavior using three adjacent {@link InternalSelectionView}
  * that report interesting rects when giving up focus, and use interesting rects
  * when taking focus to best select the internal row to show as selected.
  */
diff --git a/core/tests/coretests/src/android/widget/focus/FocusChangeWithInterestingRectHintTest.java b/core/tests/coretests/src/android/widget/focus/FocusChangeWithInterestingRectHintTest.java
index 26dc23398366..16a0b35c2dd5 100644
--- a/core/tests/coretests/src/android/widget/focus/FocusChangeWithInterestingRectHintTest.java
+++ b/core/tests/coretests/src/android/widget/focus/FocusChangeWithInterestingRectHintTest.java
@@ -17,7 +17,7 @@
 package android.widget.focus;
 
 import android.test.ActivityInstrumentationTestCase;
-import android.util.InternalSelectionView;
+import android.widget.InternalSelectionView;
 import android.view.KeyEvent;
 
 import androidx.test.filters.LargeTest;
@@ -31,7 +31,7 @@ import androidx.test.filters.MediumTest;
  * rectangle of the previously focused view.  The view taking focus can use this
  * to set an internal selection more appropriate using this rect.
  *
- * This tests that behavior using three adjacent {@link android.util.InternalSelectionView}
+ * This tests that behavior using three adjacent {@link InternalSelectionView}
  * that report interesting rects when giving up focus, and use interesting rects
  * when taking focus to best select the internal row to show as selected.
  *
diff --git a/core/tests/coretests/src/android/widget/focus/ListOfInternalSelectionViews.java b/core/tests/coretests/src/android/widget/focus/ListOfInternalSelectionViews.java
index c5e69b67862f..4231b40431f1 100644
--- a/core/tests/coretests/src/android/widget/focus/ListOfInternalSelectionViews.java
+++ b/core/tests/coretests/src/android/widget/focus/ListOfInternalSelectionViews.java
@@ -18,7 +18,7 @@ package android.widget.focus;
 
 import android.app.Activity;
 import android.os.Bundle;
-import android.util.InternalSelectionView;
+import android.widget.InternalSelectionView;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
diff --git a/core/tests/coretests/src/android/widget/focus/ScrollingThroughListOfFocusablesTest.java b/core/tests/coretests/src/android/widget/focus/ScrollingThroughListOfFocusablesTest.java
index e6e76ccc2caf..46190c4ce7c7 100644
--- a/core/tests/coretests/src/android/widget/focus/ScrollingThroughListOfFocusablesTest.java
+++ b/core/tests/coretests/src/android/widget/focus/ScrollingThroughListOfFocusablesTest.java
@@ -18,7 +18,7 @@ package android.widget.focus;
 
 import android.graphics.Rect;
 import android.test.InstrumentationTestCase;
-import android.util.InternalSelectionView;
+import android.widget.InternalSelectionView;
 import android.view.KeyEvent;
 import android.widget.ListView;
 
diff --git a/core/tests/coretests/src/android/widget/gridview/GridDelete.java b/core/tests/coretests/src/android/widget/gridview/GridDelete.java
index b040f69545f1..5f4326cd7758 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridDelete.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridDelete.java
@@ -16,7 +16,7 @@
 
 package android.widget.gridview;
 
-import android.util.GridScenario;
+import android.widget.GridScenario;
 import android.view.KeyEvent;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/core/tests/coretests/src/android/widget/gridview/GridSetSelection.java b/core/tests/coretests/src/android/widget/gridview/GridSetSelection.java
index a3cda3b1f030..140dd7b696fd 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridSetSelection.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridSetSelection.java
@@ -16,7 +16,7 @@
 
 package android.widget.gridview;
 
-import android.util.GridScenario;
+import android.widget.GridScenario;
 
 /**
  * Basic stacking from top scenario, nothing fancy. Items do not
diff --git a/core/tests/coretests/src/android/widget/gridview/GridSetSelectionBaseTest.java b/core/tests/coretests/src/android/widget/gridview/GridSetSelectionBaseTest.java
index db4f2dc224fc..1428fea9fc87 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridSetSelectionBaseTest.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridSetSelectionBaseTest.java
@@ -18,7 +18,7 @@ package android.widget.gridview;
 
 import android.test.ActivityInstrumentationTestCase;
 import android.test.ViewAsserts;
-import android.util.GridScenario;
+import android.widget.GridScenario;
 import android.widget.GridView;
 
 import androidx.test.filters.MediumTest;
diff --git a/core/tests/coretests/src/android/widget/gridview/GridSetSelectionMany.java b/core/tests/coretests/src/android/widget/gridview/GridSetSelectionMany.java
index a6d481f8a9fd..71766195fcc7 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridSetSelectionMany.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridSetSelectionMany.java
@@ -16,7 +16,7 @@
 
 package android.widget.gridview;
 
-import android.util.GridScenario;
+import android.widget.GridScenario;
 
 /**
  * Basic stacking from top scenario, nothing fancy. Items do
diff --git a/core/tests/coretests/src/android/widget/gridview/GridSetSelectionStackFromBottom.java b/core/tests/coretests/src/android/widget/gridview/GridSetSelectionStackFromBottom.java
index dfcd5fc09cc2..01bb2be37fb8 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridSetSelectionStackFromBottom.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridSetSelectionStackFromBottom.java
@@ -16,7 +16,7 @@
 
 package android.widget.gridview;
 
-import android.util.GridScenario;
+import android.widget.GridScenario;
 
 /**
  * Basic stacking from bottom scenario, nothing fancy. Items do not
diff --git a/core/tests/coretests/src/android/widget/gridview/GridSetSelectionStackFromBottomMany.java b/core/tests/coretests/src/android/widget/gridview/GridSetSelectionStackFromBottomMany.java
index 26a567e90cef..d79ee880ec97 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridSetSelectionStackFromBottomMany.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridSetSelectionStackFromBottomMany.java
@@ -16,7 +16,7 @@
 
 package android.widget.gridview;
 
-import android.util.GridScenario;
+import android.widget.GridScenario;
 
 /**
  * Basic stacking from bottom scenario, nothing fancy. Items do
diff --git a/core/tests/coretests/src/android/widget/gridview/GridSimple.java b/core/tests/coretests/src/android/widget/gridview/GridSimple.java
index 67bb7511122a..6ca7eaa14f40 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridSimple.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridSimple.java
@@ -18,7 +18,7 @@ package android.widget.gridview;
 
 import android.graphics.drawable.PaintDrawable;
 import android.os.Bundle;
-import android.util.GridScenario;
+import android.widget.GridScenario;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
diff --git a/core/tests/coretests/src/android/widget/gridview/GridSingleColumn.java b/core/tests/coretests/src/android/widget/gridview/GridSingleColumn.java
index 566e71b7e14f..aaed9ba2789f 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridSingleColumn.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridSingleColumn.java
@@ -16,7 +16,7 @@
 
 package android.widget.gridview;
 
-import android.util.GridScenario;
+import android.widget.GridScenario;
 import android.widget.GridView;
 
 /**
diff --git a/core/tests/coretests/src/android/widget/gridview/GridStackFromBottom.java b/core/tests/coretests/src/android/widget/gridview/GridStackFromBottom.java
index 2f0a88fc9767..457b00ddce54 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridStackFromBottom.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridStackFromBottom.java
@@ -16,7 +16,7 @@
 
 package android.widget.gridview;
 
-import android.util.GridScenario;
+import android.widget.GridScenario;
 
 /**
  * Basic bottom stacking from bottom scenario, nothing fancy. Items do not
diff --git a/core/tests/coretests/src/android/widget/gridview/GridStackFromBottomMany.java b/core/tests/coretests/src/android/widget/gridview/GridStackFromBottomMany.java
index 33a9592fdc9b..9029bc57ac85 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridStackFromBottomMany.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridStackFromBottomMany.java
@@ -16,7 +16,7 @@
 
 package android.widget.gridview;
 
-import android.util.GridScenario;
+import android.widget.GridScenario;
 
 /**
  * Basic bottom stacking from bottom scenario, nothing fancy. The grid items do not fit on the
diff --git a/core/tests/coretests/src/android/widget/gridview/GridVerticalSpacing.java b/core/tests/coretests/src/android/widget/gridview/GridVerticalSpacing.java
index 0d01d3087d9d..6aa864f756fc 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridVerticalSpacing.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridVerticalSpacing.java
@@ -16,7 +16,7 @@
 
 package android.widget.gridview;
 
-import android.util.GridScenario;
+import android.widget.GridScenario;
 
 /**
  * A grid with vertical spacing between rows
diff --git a/core/tests/coretests/src/android/widget/gridview/GridVerticalSpacingStackFromBottom.java b/core/tests/coretests/src/android/widget/gridview/GridVerticalSpacingStackFromBottom.java
index bd686809dba7..25ef6820c8b5 100644
--- a/core/tests/coretests/src/android/widget/gridview/GridVerticalSpacingStackFromBottom.java
+++ b/core/tests/coretests/src/android/widget/gridview/GridVerticalSpacingStackFromBottom.java
@@ -16,7 +16,7 @@
 
 package android.widget.gridview;
 
-import android.util.GridScenario;
+import android.widget.GridScenario;
 
 /**
  * A grid with vertical spacing between rows that stacks from the bottom
diff --git a/core/tests/coretests/src/android/widget/listview/AdjacentListsWithAdjacentISVsInside.java b/core/tests/coretests/src/android/widget/listview/AdjacentListsWithAdjacentISVsInside.java
index 62b93d6d208a..1e57d69edec6 100644
--- a/core/tests/coretests/src/android/widget/listview/AdjacentListsWithAdjacentISVsInside.java
+++ b/core/tests/coretests/src/android/widget/listview/AdjacentListsWithAdjacentISVsInside.java
@@ -18,7 +18,7 @@ package android.widget.listview;
 
 import android.app.Activity;
 import android.os.Bundle;
-import android.util.InternalSelectionView;
+import android.widget.InternalSelectionView;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
diff --git a/core/tests/coretests/src/android/widget/listview/ListBottomGravity.java b/core/tests/coretests/src/android/widget/listview/ListBottomGravity.java
index cd76d70acdaf..5d319c5f4930 100644
--- a/core/tests/coretests/src/android/widget/listview/ListBottomGravity.java
+++ b/core/tests/coretests/src/android/widget/listview/ListBottomGravity.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * Basic bottom gravity scenario, nothing fancy. Items do not
diff --git a/core/tests/coretests/src/android/widget/listview/ListBottomGravityMany.java b/core/tests/coretests/src/android/widget/listview/ListBottomGravityMany.java
index e048e3eb98a0..331fd121370c 100644
--- a/core/tests/coretests/src/android/widget/listview/ListBottomGravityMany.java
+++ b/core/tests/coretests/src/android/widget/listview/ListBottomGravityMany.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * Basic bottom gravity scenario, nothing fancy. There are
diff --git a/core/tests/coretests/src/android/widget/listview/ListButtonsDiagonalAcrossItems.java b/core/tests/coretests/src/android/widget/listview/ListButtonsDiagonalAcrossItems.java
index 86407411c2d0..bc7c19f34fd9 100644
--- a/core/tests/coretests/src/android/widget/listview/ListButtonsDiagonalAcrossItems.java
+++ b/core/tests/coretests/src/android/widget/listview/ListButtonsDiagonalAcrossItems.java
@@ -19,7 +19,7 @@ package android.widget.listview;
 import static android.util.ListItemFactory.Slot;
 
 import android.util.ListItemFactory;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
diff --git a/core/tests/coretests/src/android/widget/listview/ListEndingWithMultipleSeparators.java b/core/tests/coretests/src/android/widget/listview/ListEndingWithMultipleSeparators.java
index 85f9924a16aa..834f0d1ec01c 100644
--- a/core/tests/coretests/src/android/widget/listview/ListEndingWithMultipleSeparators.java
+++ b/core/tests/coretests/src/android/widget/listview/ListEndingWithMultipleSeparators.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 public class ListEndingWithMultipleSeparators extends ListScenario {
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListGetSelectedView.java b/core/tests/coretests/src/android/widget/listview/ListGetSelectedView.java
index 5639195198f1..abd5d2e5dab4 100644
--- a/core/tests/coretests/src/android/widget/listview/ListGetSelectedView.java
+++ b/core/tests/coretests/src/android/widget/listview/ListGetSelectedView.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * Basic top gravity scenario. This test is made to check that getSelectedView() will return
diff --git a/core/tests/coretests/src/android/widget/listview/ListHeterogeneous.java b/core/tests/coretests/src/android/widget/listview/ListHeterogeneous.java
index 74eda3b850b9..fd24d61d4327 100644
--- a/core/tests/coretests/src/android/widget/listview/ListHeterogeneous.java
+++ b/core/tests/coretests/src/android/widget/listview/ListHeterogeneous.java
@@ -17,7 +17,7 @@
 package android.widget.listview;
 
 import android.util.ListItemFactory;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListHorizontalFocusWithinItemWins.java b/core/tests/coretests/src/android/widget/listview/ListHorizontalFocusWithinItemWins.java
index e98de9c1204c..7ce5ee3d2f81 100644
--- a/core/tests/coretests/src/android/widget/listview/ListHorizontalFocusWithinItemWins.java
+++ b/core/tests/coretests/src/android/widget/listview/ListHorizontalFocusWithinItemWins.java
@@ -20,7 +20,7 @@ import static android.util.ListItemFactory.Slot;
 
 import android.content.Context;
 import android.util.ListItemFactory;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
diff --git a/core/tests/coretests/src/android/widget/listview/ListInterleaveFocusables.java b/core/tests/coretests/src/android/widget/listview/ListInterleaveFocusables.java
index 0ec7a2431b93..b613741a9c62 100644
--- a/core/tests/coretests/src/android/widget/listview/ListInterleaveFocusables.java
+++ b/core/tests/coretests/src/android/widget/listview/ListInterleaveFocusables.java
@@ -17,7 +17,7 @@
 package android.widget.listview;
 
 import android.util.ListItemFactory;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListItemFocusableAboveUnfocusable.java b/core/tests/coretests/src/android/widget/listview/ListItemFocusableAboveUnfocusable.java
index 3159e53eabc5..dc40f5f5d98b 100644
--- a/core/tests/coretests/src/android/widget/listview/ListItemFocusableAboveUnfocusable.java
+++ b/core/tests/coretests/src/android/widget/listview/ListItemFocusableAboveUnfocusable.java
@@ -17,7 +17,7 @@
 package android.widget.listview;
 
 import android.util.ListItemFactory;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListItemFocusablesClose.java b/core/tests/coretests/src/android/widget/listview/ListItemFocusablesClose.java
index 861e2a919052..d21d234c92aa 100644
--- a/core/tests/coretests/src/android/widget/listview/ListItemFocusablesClose.java
+++ b/core/tests/coretests/src/android/widget/listview/ListItemFocusablesClose.java
@@ -17,7 +17,7 @@
 package android.widget.listview;
 
 import android.util.ListItemFactory;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListItemFocusablesFarApart.java b/core/tests/coretests/src/android/widget/listview/ListItemFocusablesFarApart.java
index e9c9c1dd586c..0bb080b071a1 100644
--- a/core/tests/coretests/src/android/widget/listview/ListItemFocusablesFarApart.java
+++ b/core/tests/coretests/src/android/widget/listview/ListItemFocusablesFarApart.java
@@ -17,7 +17,7 @@
 package android.widget.listview;
 
 import android.util.ListItemFactory;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListItemISVAndButton.java b/core/tests/coretests/src/android/widget/listview/ListItemISVAndButton.java
index 2a0e013be616..cbe07cc475f0 100644
--- a/core/tests/coretests/src/android/widget/listview/ListItemISVAndButton.java
+++ b/core/tests/coretests/src/android/widget/listview/ListItemISVAndButton.java
@@ -17,8 +17,8 @@
 package android.widget.listview;
 
 import android.content.Context;
-import android.util.InternalSelectionView;
-import android.util.ListScenario;
+import android.widget.InternalSelectionView;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
diff --git a/core/tests/coretests/src/android/widget/listview/ListItemsExpandOnSelection.java b/core/tests/coretests/src/android/widget/listview/ListItemsExpandOnSelection.java
index d80fd90de53e..240119e947d6 100644
--- a/core/tests/coretests/src/android/widget/listview/ListItemsExpandOnSelection.java
+++ b/core/tests/coretests/src/android/widget/listview/ListItemsExpandOnSelection.java
@@ -17,7 +17,7 @@
 package android.widget.listview;
 
 import android.content.Context;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AbsListView;
diff --git a/core/tests/coretests/src/android/widget/listview/ListLastItemPartiallyVisible.java b/core/tests/coretests/src/android/widget/listview/ListLastItemPartiallyVisible.java
index d7337497a443..48c70d6cd84c 100644
--- a/core/tests/coretests/src/android/widget/listview/ListLastItemPartiallyVisible.java
+++ b/core/tests/coretests/src/android/widget/listview/ListLastItemPartiallyVisible.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * A list where the very last item is partially visible, but still requires scrolling
diff --git a/core/tests/coretests/src/android/widget/listview/ListOfItemsShorterThanScreen.java b/core/tests/coretests/src/android/widget/listview/ListOfItemsShorterThanScreen.java
index 46decfa2e578..55af8d47c803 100644
--- a/core/tests/coretests/src/android/widget/listview/ListOfItemsShorterThanScreen.java
+++ b/core/tests/coretests/src/android/widget/listview/ListOfItemsShorterThanScreen.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 public class ListOfItemsShorterThanScreen extends ListScenario {
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListOfItemsTallerThanScreen.java b/core/tests/coretests/src/android/widget/listview/ListOfItemsTallerThanScreen.java
index 0d8899371085..2b619e95f5dc 100644
--- a/core/tests/coretests/src/android/widget/listview/ListOfItemsTallerThanScreen.java
+++ b/core/tests/coretests/src/android/widget/listview/ListOfItemsTallerThanScreen.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 public class ListOfItemsTallerThanScreen extends ListScenario {
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListOfShortShortTallShortShort.java b/core/tests/coretests/src/android/widget/listview/ListOfShortShortTallShortShort.java
index 1639aa457cac..09f56b38578f 100644
--- a/core/tests/coretests/src/android/widget/listview/ListOfShortShortTallShortShort.java
+++ b/core/tests/coretests/src/android/widget/listview/ListOfShortShortTallShortShort.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * Exposes fading in and out multiple items.
diff --git a/core/tests/coretests/src/android/widget/listview/ListOfShortTallShort.java b/core/tests/coretests/src/android/widget/listview/ListOfShortTallShort.java
index 960e1297cb22..8ad8fff735fe 100644
--- a/core/tests/coretests/src/android/widget/listview/ListOfShortTallShort.java
+++ b/core/tests/coretests/src/android/widget/listview/ListOfShortTallShort.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * Two short items separated by one that is taller than the screen.
diff --git a/core/tests/coretests/src/android/widget/listview/ListOfThinItems.java b/core/tests/coretests/src/android/widget/listview/ListOfThinItems.java
index 007479f01a77..3f703afea752 100644
--- a/core/tests/coretests/src/android/widget/listview/ListOfThinItems.java
+++ b/core/tests/coretests/src/android/widget/listview/ListOfThinItems.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 public class ListOfThinItems extends ListScenario {
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListOfTouchables.java b/core/tests/coretests/src/android/widget/listview/ListOfTouchables.java
index 70b9081128a0..f1dcdad20e89 100644
--- a/core/tests/coretests/src/android/widget/listview/ListOfTouchables.java
+++ b/core/tests/coretests/src/android/widget/listview/ListOfTouchables.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
diff --git a/core/tests/coretests/src/android/widget/listview/ListSetSelection.java b/core/tests/coretests/src/android/widget/listview/ListSetSelection.java
index af8e899a867a..a107117250b0 100644
--- a/core/tests/coretests/src/android/widget/listview/ListSetSelection.java
+++ b/core/tests/coretests/src/android/widget/listview/ListSetSelection.java
@@ -17,7 +17,7 @@
 package android.widget.listview;
 
 import android.os.Bundle;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.KeyEvent;
 import android.view.View;
 import android.widget.Button;
diff --git a/core/tests/coretests/src/android/widget/listview/ListSimple.java b/core/tests/coretests/src/android/widget/listview/ListSimple.java
index f53638eb8ff1..9b3a98fe44d6 100644
--- a/core/tests/coretests/src/android/widget/listview/ListSimple.java
+++ b/core/tests/coretests/src/android/widget/listview/ListSimple.java
@@ -17,7 +17,7 @@
 package android.widget.listview;
 
 import android.os.Bundle;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
diff --git a/core/tests/coretests/src/android/widget/listview/ListTopGravity.java b/core/tests/coretests/src/android/widget/listview/ListTopGravity.java
index 31339e9ee9c2..67ef6d15538e 100644
--- a/core/tests/coretests/src/android/widget/listview/ListTopGravity.java
+++ b/core/tests/coretests/src/android/widget/listview/ListTopGravity.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * Basic top gravity scenario, nothing fancy. Items do not
diff --git a/core/tests/coretests/src/android/widget/listview/ListTopGravityMany.java b/core/tests/coretests/src/android/widget/listview/ListTopGravityMany.java
index 5592ad9f6d20..9618c81de5e1 100644
--- a/core/tests/coretests/src/android/widget/listview/ListTopGravityMany.java
+++ b/core/tests/coretests/src/android/widget/listview/ListTopGravityMany.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * Basic top gravity scenario, nothing fancy. There are
diff --git a/core/tests/coretests/src/android/widget/listview/ListWithEditTextHeader.java b/core/tests/coretests/src/android/widget/listview/ListWithEditTextHeader.java
index 5303faf8d320..1a204a24b9e3 100644
--- a/core/tests/coretests/src/android/widget/listview/ListWithEditTextHeader.java
+++ b/core/tests/coretests/src/android/widget/listview/ListWithEditTextHeader.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * A list view with a single edit text in a header.
diff --git a/core/tests/coretests/src/android/widget/listview/ListWithFirstScreenUnSelectable.java b/core/tests/coretests/src/android/widget/listview/ListWithFirstScreenUnSelectable.java
index 526128371375..d6e7c6fe6c9e 100644
--- a/core/tests/coretests/src/android/widget/listview/ListWithFirstScreenUnSelectable.java
+++ b/core/tests/coretests/src/android/widget/listview/ListWithFirstScreenUnSelectable.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * The first item is unselectable, and takes up the whole screen.
diff --git a/core/tests/coretests/src/android/widget/listview/ListWithHeaders.java b/core/tests/coretests/src/android/widget/listview/ListWithHeaders.java
index 6030582a2445..fa2832edf614 100644
--- a/core/tests/coretests/src/android/widget/listview/ListWithHeaders.java
+++ b/core/tests/coretests/src/android/widget/listview/ListWithHeaders.java
@@ -17,7 +17,7 @@
 package android.widget.listview;
 
 import android.os.Bundle;
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.widget.Button;
 import android.widget.ListAdapter;
 import android.widget.ListView;
diff --git a/core/tests/coretests/src/android/widget/listview/ListWithNoFadingEdge.java b/core/tests/coretests/src/android/widget/listview/ListWithNoFadingEdge.java
index b870fc855646..f8b4f786820a 100644
--- a/core/tests/coretests/src/android/widget/listview/ListWithNoFadingEdge.java
+++ b/core/tests/coretests/src/android/widget/listview/ListWithNoFadingEdge.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 public class ListWithNoFadingEdge extends ListScenario {
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListWithOffScreenNextSelectable.java b/core/tests/coretests/src/android/widget/listview/ListWithOffScreenNextSelectable.java
index 2e65bd0f2ffe..b8f14d21c1e1 100644
--- a/core/tests/coretests/src/android/widget/listview/ListWithOffScreenNextSelectable.java
+++ b/core/tests/coretests/src/android/widget/listview/ListWithOffScreenNextSelectable.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * Pressing down from position 0 requires looking past positions 1, 2 and 3 to
diff --git a/core/tests/coretests/src/android/widget/listview/ListWithOnItemSelectedAction.java b/core/tests/coretests/src/android/widget/listview/ListWithOnItemSelectedAction.java
index 13e770cd4e47..afc4c3b754c7 100644
--- a/core/tests/coretests/src/android/widget/listview/ListWithOnItemSelectedAction.java
+++ b/core/tests/coretests/src/android/widget/listview/ListWithOnItemSelectedAction.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 import android.widget.TextView;
 
 /**
diff --git a/core/tests/coretests/src/android/widget/listview/ListWithScreenOfNoSelectables.java b/core/tests/coretests/src/android/widget/listview/ListWithScreenOfNoSelectables.java
index 108ac4d9e6f6..fe33bf05acb3 100644
--- a/core/tests/coretests/src/android/widget/listview/ListWithScreenOfNoSelectables.java
+++ b/core/tests/coretests/src/android/widget/listview/ListWithScreenOfNoSelectables.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 public class ListWithScreenOfNoSelectables extends ListScenario {
 
diff --git a/core/tests/coretests/src/android/widget/listview/ListWithSeparators.java b/core/tests/coretests/src/android/widget/listview/ListWithSeparators.java
index 0f4f2d88a41b..1a3955a4b1cb 100644
--- a/core/tests/coretests/src/android/widget/listview/ListWithSeparators.java
+++ b/core/tests/coretests/src/android/widget/listview/ListWithSeparators.java
@@ -16,7 +16,7 @@
 
 package android.widget.listview;
 
-import android.util.ListScenario;
+import android.widget.ListScenario;
 
 /**
  * Basic separator scenario, nothing fancy.
diff --git a/core/tests/coretests/src/android/widget/listview/focus/AdjacentListsWithAdjacentISVsInsideTest.java b/core/tests/coretests/src/android/widget/listview/focus/AdjacentListsWithAdjacentISVsInsideTest.java
index e9baabf3175a..09c140ee96d9 100644
--- a/core/tests/coretests/src/android/widget/listview/focus/AdjacentListsWithAdjacentISVsInsideTest.java
+++ b/core/tests/coretests/src/android/widget/listview/focus/AdjacentListsWithAdjacentISVsInsideTest.java
@@ -17,7 +17,7 @@
 package android.widget.listview.focus;
 
 import android.test.ActivityInstrumentationTestCase;
-import android.util.InternalSelectionView;
+import android.widget.InternalSelectionView;
 import android.view.KeyEvent;
 import android.widget.ListView;
 import android.widget.listview.AdjacentListsWithAdjacentISVsInside;
diff --git a/core/tests/coretests/src/android/widget/scroll/ButtonAboveTallInternalSelectionView.java b/core/tests/coretests/src/android/widget/scroll/ButtonAboveTallInternalSelectionView.java
index a30985bfaf87..30f5c67f9f4e 100644
--- a/core/tests/coretests/src/android/widget/scroll/ButtonAboveTallInternalSelectionView.java
+++ b/core/tests/coretests/src/android/widget/scroll/ButtonAboveTallInternalSelectionView.java
@@ -16,8 +16,8 @@
 
 package android.widget.scroll;
 
-import android.util.InternalSelectionView;
-import android.util.ScrollViewScenario;
+import android.widget.InternalSelectionView;
+import android.widget.ScrollViewScenario;
 import android.widget.Button;
 
 /**
diff --git a/core/tests/coretests/src/android/widget/scroll/ButtonAboveTallInternalSelectionViewTest.java b/core/tests/coretests/src/android/widget/scroll/ButtonAboveTallInternalSelectionViewTest.java
index 825aa1aa85a3..d977ab4c7efa 100644
--- a/core/tests/coretests/src/android/widget/scroll/ButtonAboveTallInternalSelectionViewTest.java
+++ b/core/tests/coretests/src/android/widget/scroll/ButtonAboveTallInternalSelectionViewTest.java
@@ -17,7 +17,7 @@
 package android.widget.scroll;
 
 import android.test.ActivityInstrumentationTestCase;
-import android.util.InternalSelectionView;
+import android.widget.InternalSelectionView;
 import android.view.KeyEvent;
 
 import androidx.test.filters.MediumTest;
diff --git a/core/tests/coretests/src/android/widget/scroll/ButtonsWithTallTextViewInBetween.java b/core/tests/coretests/src/android/widget/scroll/ButtonsWithTallTextViewInBetween.java
index 47d36ddf9be1..5149fd43bc65 100644
--- a/core/tests/coretests/src/android/widget/scroll/ButtonsWithTallTextViewInBetween.java
+++ b/core/tests/coretests/src/android/widget/scroll/ButtonsWithTallTextViewInBetween.java
@@ -16,7 +16,7 @@
 
 package android.widget.scroll;
 
-import android.util.ScrollViewScenario;
+import android.widget.ScrollViewScenario;
 import android.widget.Button;
 import android.widget.LinearLayout;
 import android.widget.TextView;
diff --git a/core/tests/coretests/src/android/widget/scroll/ShortButtons.java b/core/tests/coretests/src/android/widget/scroll/ShortButtons.java
index 90ede7d35511..01d3b53ba062 100644
--- a/core/tests/coretests/src/android/widget/scroll/ShortButtons.java
+++ b/core/tests/coretests/src/android/widget/scroll/ShortButtons.java
@@ -16,7 +16,7 @@
 
 package android.widget.scroll;
 
-import android.util.ScrollViewScenario;
+import android.widget.ScrollViewScenario;
 import android.widget.Button;
 import android.widget.LinearLayout;
 
diff --git a/core/tests/coretests/src/android/widget/scroll/TallTextAboveButton.java b/core/tests/coretests/src/android/widget/scroll/TallTextAboveButton.java
index 4096fe9c1c2e..bf800c0d09d7 100644
--- a/core/tests/coretests/src/android/widget/scroll/TallTextAboveButton.java
+++ b/core/tests/coretests/src/android/widget/scroll/TallTextAboveButton.java
@@ -16,7 +16,7 @@
 
 package android.widget.scroll;
 
-import android.util.ScrollViewScenario;
+import android.widget.ScrollViewScenario;
 
 /**
  * An (unfocusable) text view that takes up more than the height
diff --git a/core/tests/coretests/src/android/widget/scroll/arrowscroll/MultiPageTextWithPadding.java b/core/tests/coretests/src/android/widget/scroll/arrowscroll/MultiPageTextWithPadding.java
index 7d5a8d8441e8..6febdf96ebbb 100644
--- a/core/tests/coretests/src/android/widget/scroll/arrowscroll/MultiPageTextWithPadding.java
+++ b/core/tests/coretests/src/android/widget/scroll/arrowscroll/MultiPageTextWithPadding.java
@@ -16,7 +16,7 @@
 
 package android.widget.scroll.arrowscroll;
 
-import android.util.ScrollViewScenario;
+import android.widget.ScrollViewScenario;
 
 /**
  * One TextView with a text covering several pages. Padding is added
diff --git a/core/tests/coretests/src/com/android/internal/util/BitUtilsTest.java b/core/tests/coretests/src/com/android/internal/util/BitUtilsTest.java
index fdba811f3eaa..fdde36ad8e35 100644
--- a/core/tests/coretests/src/com/android/internal/util/BitUtilsTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/BitUtilsTest.java
@@ -30,8 +30,8 @@ import static com.android.internal.util.BitUtils.unpackBits;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
-import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
diff --git a/core/tests/coretests/src/com/android/internal/util/ContrastColorUtilTest.java b/core/tests/coretests/src/com/android/internal/util/ContrastColorUtilTest.java
index 5f5bf1165004..e6ebfefd2aea 100644
--- a/core/tests/coretests/src/com/android/internal/util/ContrastColorUtilTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/ContrastColorUtilTest.java
@@ -23,6 +23,8 @@ import static com.google.common.truth.Truth.assertThat;
 import android.content.Context;
 import android.content.res.ColorStateList;
 import android.graphics.Color;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 import android.text.Spannable;
 import android.text.SpannableString;
 import android.text.SpannableStringBuilder;
@@ -32,23 +34,21 @@ import android.text.style.TextAppearanceSpan;
 
 import androidx.test.InstrumentationRegistry;
 import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
 import com.android.internal.R;
 
-import junit.framework.TestCase;
-
-import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
-public class ContrastColorUtilTest extends TestCase {
-
-    private Context mContext;
-
-    @Before
-    public void setUp() {
-        mContext = InstrumentationRegistry.getContext();
-    }
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = Color.class)
+public class ContrastColorUtilTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
 
+    @Test
     @SmallTest
     public void testEnsureTextContrastAgainstDark() {
         int darkBg = 0xFF35302A;
@@ -70,6 +70,7 @@ public class ContrastColorUtilTest extends TestCase {
         assertContrastIsWithinRange(selfContrastColor, darkBg, 4.5, 4.75);
     }
 
+    @Test
     @SmallTest
     public void testEnsureTextContrastAgainstLight() {
         int lightBg = 0xFFFFF8F2;
@@ -91,13 +92,16 @@ public class ContrastColorUtilTest extends TestCase {
         assertContrastIsWithinRange(selfContrastColor, lightBg, 4.5, 4.75);
     }
 
+    @Test
     public void testBuilder_ensureColorSpanContrast_removesAllFullLengthColorSpans() {
+        Context context = InstrumentationRegistry.getContext();
+
         Spannable text = new SpannableString("blue text with yellow and green");
         text.setSpan(new ForegroundColorSpan(Color.YELLOW), 15, 21,
                 Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
         text.setSpan(new ForegroundColorSpan(Color.BLUE), 0, text.length(),
                 Spanned.SPAN_INCLUSIVE_INCLUSIVE);
-        TextAppearanceSpan taSpan = new TextAppearanceSpan(mContext,
+        TextAppearanceSpan taSpan = new TextAppearanceSpan(context,
                 R.style.TextAppearance_DeviceDefault_Notification_Title);
         assertThat(taSpan.getTextColor()).isNotNull();  // it must be set to prove it is cleared.
         text.setSpan(taSpan, 0, text.length(),
@@ -123,6 +127,7 @@ public class ContrastColorUtilTest extends TestCase {
         assertThat(((ForegroundColorSpan) spans[2]).getForegroundColor()).isEqualTo(Color.GREEN);
     }
 
+    @Test
     public void testBuilder_ensureColorSpanContrast_partialLength_adjusted() {
         int background = 0xFFFF0101;  // Slightly lighter red
         CharSequence text = new SpannableStringBuilder()
@@ -138,14 +143,17 @@ public class ContrastColorUtilTest extends TestCase {
         assertContrastIsWithinRange(foregroundColor, background, 3, 3.2);
     }
 
+    @Test
     public void testBuilder_ensureColorSpanContrast_worksWithComplexInput() {
+        Context context = InstrumentationRegistry.getContext();
+
         Spannable text = new SpannableString("blue text with yellow and green and cyan");
         text.setSpan(new ForegroundColorSpan(Color.YELLOW), 15, 21,
                 Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
         text.setSpan(new ForegroundColorSpan(Color.BLUE), 0, text.length(),
                 Spanned.SPAN_INCLUSIVE_INCLUSIVE);
         // cyan TextAppearanceSpan
-        TextAppearanceSpan taSpan = new TextAppearanceSpan(mContext,
+        TextAppearanceSpan taSpan = new TextAppearanceSpan(context,
                 R.style.TextAppearance_DeviceDefault_Notification_Title);
         taSpan = new TextAppearanceSpan(taSpan.getFamily(), taSpan.getTextStyle(),
                 taSpan.getTextSize(), ColorStateList.valueOf(Color.CYAN), null);
diff --git a/core/tests/coretests/src/com/android/internal/util/DumpUtilsTest.java b/core/tests/coretests/src/com/android/internal/util/DumpUtilsTest.java
index 36c2a62ae6ed..d2d3c134f390 100644
--- a/core/tests/coretests/src/com/android/internal/util/DumpUtilsTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/DumpUtilsTest.java
@@ -25,10 +25,16 @@ import static com.android.internal.util.DumpUtils.isPlatformPackage;
 
 import static com.google.common.truth.Truth.assertWithMessage;
 
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 import android.content.ComponentName;
 import android.util.SparseArray;
 
-import junit.framework.TestCase;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.io.PrintWriter;
 import java.io.StringWriter;
@@ -37,7 +43,8 @@ import java.io.StringWriter;
  * Run with:
  atest FrameworksCoreTests:DumpUtilsTest
  */
-public class DumpUtilsTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class DumpUtilsTest {
 
     private final StringWriter mStringWriter = new StringWriter();
     private final PrintWriter mPrintWriter = new PrintWriter(mStringWriter);
@@ -56,6 +63,7 @@ public class DumpUtilsTest extends TestCase {
         return () -> cn(componentName);
     }
 
+    @Test
     public void testIsPlatformPackage() {
         assertTrue(isPlatformPackage("android"));
         assertTrue(isPlatformPackage("android.abc"));
@@ -79,6 +87,7 @@ public class DumpUtilsTest extends TestCase {
         assertFalse(isPlatformPackage(wcn("com.google.def/abc")));
     }
 
+    @Test
     public void testIsNonPlatformPackage() {
         assertFalse(isNonPlatformPackage("android"));
         assertFalse(isNonPlatformPackage("android.abc"));
@@ -102,6 +111,7 @@ public class DumpUtilsTest extends TestCase {
         assertTrue(isNonPlatformPackage(wcn("com.google.def/abc")));
     }
 
+    @Test
     public void testIsPlatformCriticalPackage() {
         for (final ComponentName componentName : CRITICAL_SECTION_COMPONENTS) {
             assertTrue(isPlatformCriticalPackage(() -> componentName));
@@ -115,6 +125,7 @@ public class DumpUtilsTest extends TestCase {
         assertFalse(isPlatformCriticalPackage(null));
     }
 
+    @Test
     public void testIsPlatformNonCriticalPackage() {
         for (final ComponentName componentName : CRITICAL_SECTION_COMPONENTS) {
             assertFalse(isPlatformNonCriticalPackage(() -> componentName));
@@ -128,6 +139,7 @@ public class DumpUtilsTest extends TestCase {
         assertFalse(isPlatformNonCriticalPackage(null));
     }
 
+    @Test
     public void testFilterRecord() {
         assertFalse(filterRecord(null).test(wcn("com.google.p/abc")));
         assertFalse(filterRecord(null).test(wcn("com.android.p/abc")));
@@ -178,6 +190,7 @@ public class DumpUtilsTest extends TestCase {
                         wcn("com.google/.abc")));
     }
 
+    @Test
     public void testDumpSparseArray_empty() {
         SparseArray<String> array = new SparseArray<>();
 
@@ -188,6 +201,7 @@ public class DumpUtilsTest extends TestCase {
         assertWithMessage("empty array dump").that(output).isEqualTo("...No whatevers\n");
     }
 
+    @Test
     public void testDumpSparseArray_oneElement() {
         SparseArray<String> array = new SparseArray<>();
         array.put(1, "uno");
@@ -201,6 +215,7 @@ public class DumpUtilsTest extends TestCase {
                 + "..0: 1->uno\n");
     }
 
+    @Test
     public void testDumpSparseArray_oneNullElement() {
         SparseArray<String> array = new SparseArray<>();
         array.put(1, null);
@@ -214,6 +229,7 @@ public class DumpUtilsTest extends TestCase {
                 + "..0: 1->(null)\n");
     }
 
+    @Test
     public void testDumpSparseArray_multipleElements() {
         SparseArray<String> array = new SparseArray<>();
         array.put(1, "uno");
@@ -231,6 +247,7 @@ public class DumpUtilsTest extends TestCase {
                 + "..2: 42->(null)\n");
     }
 
+    @Test
     public void testDumpSparseArray_keyDumperOnly() {
         SparseArray<String> array = new SparseArray<>();
         array.put(1, "uno");
@@ -251,6 +268,7 @@ public class DumpUtilsTest extends TestCase {
                 + "_2=42_(null)\n");
     }
 
+    @Test
     public void testDumpSparseArray_valueDumperOnly() {
         SparseArray<String> array = new SparseArray<>();
         array.put(1, "uno");
@@ -272,6 +290,7 @@ public class DumpUtilsTest extends TestCase {
                 + "..2: 42->(null)\n");
     }
 
+    @Test
     public void testDumpSparseArray_keyAndValueDumpers() {
         SparseArray<String> array = new SparseArray<>();
         array.put(1, "uno");
@@ -295,6 +314,7 @@ public class DumpUtilsTest extends TestCase {
                 + "_2=42_(null)\n");
     }
 
+    @Test
     public void testDumpSparseArrayValues() {
         SparseArray<String> array = new SparseArray<>();
         array.put(1, "uno");
@@ -306,7 +326,7 @@ public class DumpUtilsTest extends TestCase {
         String output = flushPrintWriter();
 
         assertWithMessage("dump of %s", array).that(output).isEqualTo(""
-                + ".3 numbers:\n"
+                + ".3 number(s):\n"
                 + "..uno\n"
                 + "..duo\n"
                 + "..(null)\n");
diff --git a/core/tests/coretests/src/com/android/internal/util/DumpableContainerImplTest.java b/core/tests/coretests/src/com/android/internal/util/DumpableContainerImplTest.java
index 589e4f98a32a..61d4e3da5036 100644
--- a/core/tests/coretests/src/com/android/internal/util/DumpableContainerImplTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/DumpableContainerImplTest.java
@@ -17,30 +17,32 @@ package com.android.internal.util;
 
 import static com.google.common.truth.Truth.assertWithMessage;
 
-import static org.testng.Assert.assertThrows;
-
 import android.util.Dumpable;
 
+import androidx.test.runner.AndroidJUnit4;
+
 import com.android.internal.util.dump.DumpableContainerImpl;
 
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.concurrent.atomic.AtomicReference;
 
-public final class DumpableContainerImplTest {
+@RunWith(AndroidJUnit4.class)
+public class DumpableContainerImplTest {
 
     private final DumpableContainerImpl mImpl = new DumpableContainerImpl();
     private final StringWriter mSw = new StringWriter();
     private final PrintWriter mWriter = new PrintWriter(mSw);
 
-    @Test
+    @Test(expected = NullPointerException.class)
     public void testAddDumpable_null() {
-        assertThrows(NullPointerException.class, () -> mImpl.addDumpable(null));
+        mImpl.addDumpable(null);
     }
 
-    @Test
+    @Test(expected = NullPointerException.class)
     public void testAddDumpable_dumpableWithoutName() {
         Dumpable namelessDumpable = new Dumpable() {
 
@@ -55,7 +57,7 @@ public final class DumpableContainerImplTest {
             }
 
         };
-        assertThrows(NullPointerException.class, () -> mImpl.addDumpable(namelessDumpable));
+        mImpl.addDumpable(namelessDumpable);
     }
 
     @Test
@@ -179,9 +181,9 @@ public final class DumpableContainerImplTest {
                         + "......6 Args: 4,8,15,16,23,42,\n");
     }
 
-    @Test
+    @Test(expected = NullPointerException.class)
     public void testRemoveDumpable_null() {
-        assertThrows(NullPointerException.class, () -> mImpl.removeDumpable(null));
+        mImpl.removeDumpable(null);
     }
 
     @Test
diff --git a/core/tests/coretests/src/com/android/internal/util/FakeLatencyTrackerTest.java b/core/tests/coretests/src/com/android/internal/util/FakeLatencyTrackerTest.java
index 3946cdf76821..6bd67ea486d1 100644
--- a/core/tests/coretests/src/com/android/internal/util/FakeLatencyTrackerTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/FakeLatencyTrackerTest.java
@@ -24,12 +24,15 @@ import static com.android.internal.util.LatencyTracker.ACTION_SHOW_VOICE_INTERAC
 
 import static com.google.common.truth.Truth.assertThat;
 
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 import android.provider.DeviceConfig;
 
-import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.runner.AndroidJUnit4;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -42,7 +45,10 @@ import java.util.List;
  * {@link LatencyTrackerTest}
  */
 @RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = DeviceConfig.class)
 public class FakeLatencyTrackerTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
 
     private FakeLatencyTracker mFakeLatencyTracker;
     private int mInitialSyncDisabledMode;
diff --git a/core/tests/coretests/src/com/android/internal/util/FastDataTest.java b/core/tests/coretests/src/com/android/internal/util/FastDataTest.java
index de325ab7d186..316b95ac1b7d 100644
--- a/core/tests/coretests/src/com/android/internal/util/FastDataTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/FastDataTest.java
@@ -21,6 +21,7 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;
 
 import android.annotation.NonNull;
+import android.platform.test.ravenwood.RavenwoodRule;
 import android.util.ExceptionUtils;
 
 import com.android.modules.utils.FastDataInput;
@@ -29,6 +30,7 @@ import com.android.modules.utils.FastDataOutput;
 import libcore.util.HexEncoding;
 
 import org.junit.Assume;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
@@ -51,6 +53,9 @@ import java.util.function.Consumer;
 
 @RunWith(Parameterized.class)
 public class FastDataTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     private final boolean use4ByteSequence;
 
     private static final String TEST_SHORT_STRING = "a";
@@ -59,7 +64,12 @@ public class FastDataTest {
 
     @Parameters(name = "use4ByteSequence={0}")
     public static Collection<Object[]> data() {
-        return Arrays.asList(new Object[][] { {true}, {false} });
+        if (RavenwoodRule.isUnderRavenwood()) {
+            // TODO: 4-byte sequences are only supported on ART
+            return Arrays.asList(new Object[][]{{false}});
+        } else {
+            return Arrays.asList(new Object[][]{{true}, {false}});
+        }
     }
 
     public FastDataTest(boolean use4ByteSequence) {
diff --git a/core/tests/coretests/src/com/android/internal/util/FastMathTest.java b/core/tests/coretests/src/com/android/internal/util/FastMathTest.java
new file mode 100644
index 000000000000..dd263345022b
--- /dev/null
+++ b/core/tests/coretests/src/com/android/internal/util/FastMathTest.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.internal.util;
+
+import static org.junit.Assert.assertEquals;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class FastMathTest {
+    @Test
+    public void testRound() {
+        assertEquals(-1, FastMath.round(-1.0f));
+        assertEquals(0, FastMath.round(0.0f));
+        assertEquals(1, FastMath.round(1.0f));
+    }
+}
diff --git a/core/tests/coretests/src/com/android/internal/util/GrowingArrayUtilsTest.java b/core/tests/coretests/src/com/android/internal/util/GrowingArrayUtilsTest.java
new file mode 100644
index 000000000000..8456161f9709
--- /dev/null
+++ b/core/tests/coretests/src/com/android/internal/util/GrowingArrayUtilsTest.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.internal.util;
+
+import static com.android.internal.util.GrowingArrayUtils.append;
+import static com.android.internal.util.GrowingArrayUtils.insert;
+
+import static org.junit.Assert.assertArrayEquals;
+
+import android.util.EmptyArray;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.Arrays;
+
+@RunWith(AndroidJUnit4.class)
+public class GrowingArrayUtilsTest {
+    private final Object TEST_OBJECT = new Object();
+
+    @Test
+    public void testAppend_Object() {
+        assertArrayEqualsPrefix(new Object[]{TEST_OBJECT},
+                append(EmptyArray.OBJECT, 0, TEST_OBJECT));
+        assertArrayEqualsPrefix(new Object[]{TEST_OBJECT, TEST_OBJECT},
+                append(new Object[]{TEST_OBJECT}, 1, TEST_OBJECT));
+        assertArrayEqualsPrefix(new Object[]{TEST_OBJECT},
+                append(new Object[]{null, null}, 0, TEST_OBJECT));
+    }
+
+    @Test
+    public void testInsert_Object() {
+        assertArrayEqualsPrefix(new Object[]{TEST_OBJECT},
+                insert(EmptyArray.OBJECT, 0, 0, TEST_OBJECT));
+        assertArrayEqualsPrefix(new Object[]{null, TEST_OBJECT},
+                insert(new Object[]{TEST_OBJECT}, 1, 0, null));
+        assertArrayEqualsPrefix(new Object[]{TEST_OBJECT, null},
+                insert(new Object[]{TEST_OBJECT}, 1, 1, null));
+        assertArrayEqualsPrefix(new Object[]{TEST_OBJECT, null, TEST_OBJECT},
+                insert(new Object[]{TEST_OBJECT, TEST_OBJECT}, 2, 1, null));
+    }
+
+    @Test
+    public void testAppend_Int() {
+        assertArrayEqualsPrefix(new int[]{42},
+                append(EmptyArray.INT, 0, 42));
+        assertArrayEqualsPrefix(new int[]{42, 42},
+                append(new int[]{42}, 1, 42));
+        assertArrayEqualsPrefix(new int[]{42},
+                append(new int[]{0, 0}, 0, 42));
+    }
+
+    @Test
+    public void testInsert_Int() {
+        assertArrayEqualsPrefix(new int[]{42},
+                insert(EmptyArray.INT, 0, 0, 42));
+        assertArrayEqualsPrefix(new int[]{21, 42},
+                insert(new int[]{42}, 1, 0, 21));
+        assertArrayEqualsPrefix(new int[]{42, 21},
+                insert(new int[]{42}, 1, 1, 21));
+        assertArrayEqualsPrefix(new int[]{42, 21, 43},
+                insert(new int[]{42, 43}, 2, 1, 21));
+    }
+
+    @Test
+    public void testAppend_Long() {
+        assertArrayEqualsPrefix(new long[]{42},
+                append(EmptyArray.LONG, 0, 42));
+        assertArrayEqualsPrefix(new long[]{42, 42},
+                append(new long[]{42}, 1, 42));
+        assertArrayEqualsPrefix(new long[]{42},
+                append(new long[]{0, 0}, 0, 42));
+    }
+
+    @Test
+    public void testInsert_Long() {
+        assertArrayEqualsPrefix(new long[]{42},
+                insert(EmptyArray.LONG, 0, 0, 42));
+        assertArrayEqualsPrefix(new long[]{21, 42},
+                insert(new long[]{42}, 1, 0, 21));
+        assertArrayEqualsPrefix(new long[]{42, 21},
+                insert(new long[]{42}, 1, 1, 21));
+        assertArrayEqualsPrefix(new long[]{42, 21, 43},
+                insert(new long[]{42, 43}, 2, 1, 21));
+    }
+
+    @Test
+    public void testAppend_Boolean() {
+        assertArrayEqualsPrefix(new boolean[]{true},
+                append(EmptyArray.BOOLEAN, 0, true));
+        assertArrayEqualsPrefix(new boolean[]{true, true},
+                append(new boolean[]{true}, 1, true));
+        assertArrayEqualsPrefix(new boolean[]{true},
+                append(new boolean[]{false, false}, 0, true));
+    }
+
+    @Test
+    public void testInsert_Boolean() {
+        assertArrayEqualsPrefix(new boolean[]{true},
+                insert(EmptyArray.BOOLEAN, 0, 0, true));
+        assertArrayEqualsPrefix(new boolean[]{false, true},
+                insert(new boolean[]{true}, 1, 0, false));
+        assertArrayEqualsPrefix(new boolean[]{true, false},
+                insert(new boolean[]{true}, 1, 1, false));
+        assertArrayEqualsPrefix(new boolean[]{true, false, true},
+                insert(new boolean[]{true, true}, 2, 1, false));
+    }
+
+    private <T> void assertArrayEqualsPrefix(T[] expected, T[] actual) {
+        assertArrayEquals(expected, Arrays.copyOf(actual, expected.length));
+    }
+
+    private void assertArrayEqualsPrefix(int[] expected, int[] actual) {
+        assertArrayEquals(expected, Arrays.copyOf(actual, expected.length));
+    }
+
+    private void assertArrayEqualsPrefix(long[] expected, long[] actual) {
+        assertArrayEquals(expected, Arrays.copyOf(actual, expected.length));
+    }
+
+    private void assertArrayEqualsPrefix(boolean[] expected, boolean[] actual) {
+        assertArrayEquals(expected, Arrays.copyOf(actual, expected.length));
+    }
+}
diff --git a/core/tests/coretests/src/com/android/internal/util/HexDumpTest.java b/core/tests/coretests/src/com/android/internal/util/HexDumpTest.java
index f1cd89bf49f4..dcffa1cf6975 100644
--- a/core/tests/coretests/src/com/android/internal/util/HexDumpTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/HexDumpTest.java
@@ -19,14 +19,22 @@ package com.android.internal.util;
 import static com.android.internal.util.HexDump.hexStringToByteArray;
 import static com.android.internal.util.HexDump.toHexString;
 
-import junit.framework.TestCase;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.Arrays;
 import java.util.Random;
 
-public final class HexDumpTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public final class HexDumpTest {
+    @Test
     public void testBytesToHexString() {
         assertEquals("abcdef", HexDump.toHexString(
                 new byte[] { (byte) 0xab, (byte) 0xcd, (byte) 0xef }, false));
@@ -34,12 +42,14 @@ public final class HexDumpTest extends TestCase {
                 new byte[] { (byte) 0xab, (byte) 0xcd, (byte) 0xef }, true));
     }
 
+    @Test
     public void testNullByteArray() {
         assertThrows(
                 NullPointerException.class,
                 () -> HexDump.toHexString(null));
     }
 
+    @Test
     public void testBytesToHexString_allByteValues() {
         byte[] bytes = new byte[256];
         for (int i = 0; i < bytes.length; i++) {
@@ -57,6 +67,7 @@ public final class HexDumpTest extends TestCase {
         assertEquals(expected, HexDump.toHexString(bytes));
     }
 
+    @Test
     public void testRoundTrip_fromBytes() {
         Random deterministicRandom = new Random(31337); // arbitrary but deterministic
         for (int length = 0; length < 100; length++) {
@@ -68,6 +79,7 @@ public final class HexDumpTest extends TestCase {
         }
     }
 
+    @Test
     public void testRoundTrip_fromString() {
         String hexString = "0123456789ABCDEF72f9a3438934c378d34f32a8b932";
         for (int length = 0; length < hexString.length(); length += 2) {
@@ -77,6 +89,7 @@ public final class HexDumpTest extends TestCase {
         }
     }
 
+    @Test
     public void testToHexString_offsetLength() {
         byte[] bytes = new byte[32];
         for (int i = 0; i < 16; i++) {
@@ -97,6 +110,7 @@ public final class HexDumpTest extends TestCase {
         }
     }
 
+    @Test
     public void testToHexString_case() {
         byte[] bytes = new byte[32];
         for (int i = 0; i < 16; i++) {
@@ -113,16 +127,19 @@ public final class HexDumpTest extends TestCase {
         assertEquals(expected.toUpperCase(), toHexString(bytes));
     }
 
+    @Test
     public void testHexStringToByteArray_empty() {
         assertBytesEqual(new byte[0], HexDump.hexStringToByteArray(""));
     }
 
+    @Test
     public void testHexStringToByteArray_null() {
         assertThrows(
                 NullPointerException.class,
                 () -> HexDump.hexStringToByteArray((String) null));
     }
 
+    @Test
     public void testHexStringToByteArray_invalidCharacters() {
         // IllegalArgumentException would probably have been better than RuntimeException, but it
         // might be too late to change now.
@@ -137,6 +154,7 @@ public final class HexDumpTest extends TestCase {
                 () -> HexDump.hexStringToByteArray("abcdefgh"));
     }
 
+    @Test
     public void testHexStringToByteArray_oddLength() {
         // IllegalArgumentException would probably have been better than
         // StringIndexOutOfBoundsException, but it might be too late to change now.
diff --git a/core/tests/coretests/src/com/android/internal/util/LatencyTrackerTest.java b/core/tests/coretests/src/com/android/internal/util/LatencyTrackerTest.java
index f24894e7f263..010f72466f3a 100644
--- a/core/tests/coretests/src/com/android/internal/util/LatencyTrackerTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/LatencyTrackerTest.java
@@ -25,9 +25,11 @@ import static com.android.internal.util.LatencyTracker.STATSD_ACTION;
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.common.truth.Truth.assertWithMessage;
 
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 import android.provider.DeviceConfig;
 
-import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.runner.AndroidJUnit4;
 
 import com.android.internal.util.LatencyTracker.ActionProperties;
 
@@ -49,7 +51,11 @@ import java.util.Map;
 import java.util.stream.Collectors;
 
 @RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = DeviceConfig.class)
 public class LatencyTrackerTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     private static final String ENUM_NAME_PREFIX = "UIACTION_LATENCY_REPORTED__ACTION__";
 
     @Rule
diff --git a/core/tests/coretests/src/com/android/internal/util/LineBreakBufferedWriterTest.java b/core/tests/coretests/src/com/android/internal/util/LineBreakBufferedWriterTest.java
index b2a2265d30ae..e6418fae7dca 100644
--- a/core/tests/coretests/src/com/android/internal/util/LineBreakBufferedWriterTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/LineBreakBufferedWriterTest.java
@@ -16,7 +16,13 @@
 
 package com.android.internal.util;
 
-import junit.framework.TestCase;
+import static org.junit.Assert.assertEquals;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.io.ByteArrayOutputStream;
 import java.io.Writer;
@@ -26,18 +32,18 @@ import java.util.List;
 /**
  * Tests for {@link IndentingPrintWriter}.
  */
-public class LineBreakBufferedWriterTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class LineBreakBufferedWriterTest {
 
     private ByteArrayOutputStream mStream;
     private RecordingWriter mWriter;
 
-    @Override
-    protected void setUp() throws Exception {
-        super.setUp();
-
+    @Before
+    public void setUp() throws Exception {
         mWriter = new RecordingWriter();
     }
 
+    @Test
     public void testLessThanBufferSize() {
         final LineBreakBufferedWriter lw = new LineBreakBufferedWriter(mWriter, 1000);
 
@@ -49,6 +55,7 @@ public class LineBreakBufferedWriterTest extends TestCase {
         assertOutput("Hello\nWorld\nTest\n");
     }
 
+    @Test
     public void testMoreThanBufferSizeNoLineBreaks() {
         final LineBreakBufferedWriter lw = new LineBreakBufferedWriter(mWriter, 20);
 
@@ -71,6 +78,7 @@ public class LineBreakBufferedWriterTest extends TestCase {
         }
     }
 
+    @Test
     public void testMoreThanBufferSizeNoLineBreaksSingleString() {
         final LineBreakBufferedWriter lw = new LineBreakBufferedWriter(mWriter, 20);
 
@@ -92,6 +100,7 @@ public class LineBreakBufferedWriterTest extends TestCase {
         }
     }
 
+    @Test
     public void testMoreThanBufferSizeLineBreakBefore() {
         final LineBreakBufferedWriter lw = new LineBreakBufferedWriter(mWriter, 20);
 
@@ -104,6 +113,7 @@ public class LineBreakBufferedWriterTest extends TestCase {
         assertOutput("aaaaaaaaaa", "bbbbcccccccccc");
     }
 
+    @Test
     public void testMoreThanBufferSizeLineBreakBeforeSingleString() {
         final LineBreakBufferedWriter lw = new LineBreakBufferedWriter(mWriter, 20);
 
@@ -115,6 +125,7 @@ public class LineBreakBufferedWriterTest extends TestCase {
         assertOutput("aaaaaaaaaa", "bbbbcccccccccc");
     }
 
+    @Test
     public void testMoreThanBufferSizeLineBreakNew() {
         final LineBreakBufferedWriter lw = new LineBreakBufferedWriter(mWriter, 20);
 
@@ -127,6 +138,7 @@ public class LineBreakBufferedWriterTest extends TestCase {
         assertOutput("aaaaaaaaaabbbbbc\nd", "ddddddddd");
     }
 
+    @Test
     public void testMoreThanBufferSizeLineBreakBeforeAndNew() {
         final LineBreakBufferedWriter lw = new LineBreakBufferedWriter(mWriter, 20);
 
@@ -139,6 +151,7 @@ public class LineBreakBufferedWriterTest extends TestCase {
         assertOutput("aaaaaaaaaa\nbbbbbc\nd", "ddddddddd");
     }
 
+    @Test
     public void testMoreThanBufferSizeInt() {
         final LineBreakBufferedWriter lw = new LineBreakBufferedWriter(mWriter, 15);
 
@@ -151,6 +164,7 @@ public class LineBreakBufferedWriterTest extends TestCase {
         assertOutput("123456789098765", "4321");
     }
 
+    @Test
     public void testMoreThanBufferSizeChar() {
         final LineBreakBufferedWriter lw = new LineBreakBufferedWriter(mWriter, 15);
 
@@ -165,6 +179,7 @@ public class LineBreakBufferedWriterTest extends TestCase {
         assertOutput("$$$$$$$$$$%%%%%", "%%%%%");
     }
 
+    @Test
     public void testMoreThanBufferSizeLineBreakNewChars() {
         final LineBreakBufferedWriter lw = new LineBreakBufferedWriter(mWriter, 20);
 
@@ -177,6 +192,7 @@ public class LineBreakBufferedWriterTest extends TestCase {
         assertOutput("aaaaaaaaaabbbbbc\nd", "ddddddddd");
     }
 
+    @Test
     public void testMoreThenInitialCapacitySimpleWrites() {
         // This check is different from testMoreThanBufferSizeChar. The initial capacity is lower
         // than the maximum buffer size here.
diff --git a/core/tests/coretests/src/com/android/internal/util/ParseUtilsTest.java b/core/tests/coretests/src/com/android/internal/util/ParseUtilsTest.java
index 867152e720dd..d24cbfef9f10 100644
--- a/core/tests/coretests/src/com/android/internal/util/ParseUtilsTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/ParseUtilsTest.java
@@ -16,13 +16,23 @@
 
 package com.android.internal.util;
 
-import junit.framework.TestCase;
+import static org.junit.Assert.assertEquals;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 /**
  * Run with:
  atest /android/pi-dev/frameworks/base/core/tests/coretests/src/com/android/internal/util/ParseUtilsTest.java
  */
-public class ParseUtilsTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class ParseUtilsTest {
+    private static final float DELTA_FLOAT = 0.0f;
+    private static final double DELTA_DOUBLE = 0.0d;
+
+    @Test
     public void testParseInt() {
         assertEquals(1, ParseUtils.parseInt(null, 1));
         assertEquals(1, ParseUtils.parseInt("", 1));
@@ -33,6 +43,7 @@ public class ParseUtilsTest extends TestCase {
         assertEquals(-2, ParseUtils.parseInt("-2", 1));
     }
 
+    @Test
     public void testParseIntWithBase() {
         assertEquals(1, ParseUtils.parseIntWithBase(null, 10, 1));
         assertEquals(1, ParseUtils.parseIntWithBase("", 10, 1));
@@ -45,6 +56,7 @@ public class ParseUtilsTest extends TestCase {
         assertEquals(-3, ParseUtils.parseIntWithBase("-10", 3, 1));
     }
 
+    @Test
     public void testParseLong() {
         assertEquals(1L, ParseUtils.parseLong(null, 1));
         assertEquals(1L, ParseUtils.parseLong("", 1));
@@ -52,6 +64,7 @@ public class ParseUtilsTest extends TestCase {
         assertEquals(2L, ParseUtils.parseLong("2", 1));
     }
 
+    @Test
     public void testParseLongWithBase() {
         assertEquals(1L, ParseUtils.parseLongWithBase(null, 10, 1));
         assertEquals(1L, ParseUtils.parseLongWithBase("", 10, 1));
@@ -69,20 +82,23 @@ public class ParseUtilsTest extends TestCase {
         assertEquals(10_000_000_000L, ParseUtils.parseLongWithBase(null, 10, 10_000_000_000L));
     }
 
+    @Test
     public void testParseFloat() {
-        assertEquals(0.5f, ParseUtils.parseFloat(null, 0.5f));
-        assertEquals(0.5f, ParseUtils.parseFloat("", 0.5f));
-        assertEquals(0.5f, ParseUtils.parseFloat("1x", 0.5f));
-        assertEquals(1.5f, ParseUtils.parseFloat("1.5", 0.5f));
+        assertEquals(0.5f, ParseUtils.parseFloat(null, 0.5f), DELTA_FLOAT);
+        assertEquals(0.5f, ParseUtils.parseFloat("", 0.5f), DELTA_FLOAT);
+        assertEquals(0.5f, ParseUtils.parseFloat("1x", 0.5f), DELTA_FLOAT);
+        assertEquals(1.5f, ParseUtils.parseFloat("1.5", 0.5f), DELTA_FLOAT);
     }
 
+    @Test
     public void testParseDouble() {
-        assertEquals(0.5, ParseUtils.parseDouble(null, 0.5));
-        assertEquals(0.5, ParseUtils.parseDouble("", 0.5));
-        assertEquals(0.5, ParseUtils.parseDouble("1x", 0.5));
-        assertEquals(1.5, ParseUtils.parseDouble("1.5", 0.5));
+        assertEquals(0.5, ParseUtils.parseDouble(null, 0.5), DELTA_DOUBLE);
+        assertEquals(0.5, ParseUtils.parseDouble("", 0.5), DELTA_DOUBLE);
+        assertEquals(0.5, ParseUtils.parseDouble("1x", 0.5), DELTA_DOUBLE);
+        assertEquals(1.5, ParseUtils.parseDouble("1.5", 0.5), DELTA_DOUBLE);
     }
 
+    @Test
     public void testParseBoolean() {
         assertEquals(false, ParseUtils.parseBoolean(null, false));
         assertEquals(true, ParseUtils.parseBoolean(null, true));
diff --git a/core/tests/coretests/src/com/android/internal/util/ProgressReporterTest.java b/core/tests/coretests/src/com/android/internal/util/ProgressReporterTest.java
index 87f2a8a67947..0d213357c9a5 100644
--- a/core/tests/coretests/src/com/android/internal/util/ProgressReporterTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/ProgressReporterTest.java
@@ -16,14 +16,28 @@
 
 package com.android.internal.util;
 
-import junit.framework.TestCase;
+import static org.junit.Assert.assertEquals;
+
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = ProgressReporter.class)
+public class ProgressReporterTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
 
-public class ProgressReporterTest extends TestCase {
     private ProgressReporter r;
 
-    @Override
-    protected void setUp() throws Exception {
-        super.setUp();
+    @Before
+    public void setUp() throws Exception {
         r = new ProgressReporter(0);
     }
 
@@ -37,6 +51,7 @@ public class ProgressReporterTest extends TestCase {
         assertEquals("len", len, range[1]);
     }
 
+    @Test
     public void testBasic() throws Exception {
         assertProgress(0);
 
@@ -50,6 +65,7 @@ public class ProgressReporterTest extends TestCase {
         assertProgress(100);
     }
 
+    @Test
     public void testSegment() throws Exception {
         r.setProgress(20);
         assertProgress(20);
@@ -68,6 +84,7 @@ public class ProgressReporterTest extends TestCase {
         assertProgress(80);
     }
 
+    @Test
     public void testSegmentOvershoot() throws Exception {
         r.setProgress(20);
         assertProgress(20);
@@ -87,6 +104,7 @@ public class ProgressReporterTest extends TestCase {
         assertProgress(60);
     }
 
+    @Test
     public void testSegmentNested() throws Exception {
         r.setProgress(20);
         assertProgress(20);
diff --git a/core/tests/coretests/src/com/android/internal/util/RingBufferTest.java b/core/tests/coretests/src/com/android/internal/util/RingBufferTest.java
index 4497770ef40d..d7a100a30ac8 100644
--- a/core/tests/coretests/src/com/android/internal/util/RingBufferTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/RingBufferTest.java
@@ -20,8 +20,8 @@ import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.fail;
 
-import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
diff --git a/core/tests/coretests/src/com/android/internal/util/TokenBucketTest.java b/core/tests/coretests/src/com/android/internal/util/TokenBucketTest.java
index 8b30828a8936..ef579fe07af5 100644
--- a/core/tests/coretests/src/com/android/internal/util/TokenBucketTest.java
+++ b/core/tests/coretests/src/com/android/internal/util/TokenBucketTest.java
@@ -16,22 +16,29 @@
 
 package com.android.internal.util;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertThrows;
+import static org.junit.Assert.assertTrue;
 
 import android.os.SystemClock;
 import android.text.format.DateUtils;
 
-import junit.framework.TestCase;
+import androidx.test.runner.AndroidJUnit4;
 
-public class TokenBucketTest extends TestCase {
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class TokenBucketTest {
 
     static final int FILL_DELTA_VERY_SHORT  = 1;
     static final int FILL_DELTA_VERY_LONG   = Integer.MAX_VALUE;
 
+    @Test
     public void testArgumentValidation() {
         assertThrow(() -> new TokenBucket(0, 1, 1));
         assertThrow(() -> new TokenBucket(1, 0, 1));
-        assertThrow(() -> new TokenBucket(1, 1, 0));
         assertThrow(() -> new TokenBucket(0, 1));
         assertThrow(() -> new TokenBucket(1, 0));
         assertThrow(() -> new TokenBucket(-1, 1, 1));
@@ -46,6 +53,7 @@ public class TokenBucketTest extends TestCase {
         new TokenBucket(5000, 1);
     }
 
+    @Test
     public void testInitialCapacity() {
         drain(new TokenBucket(FILL_DELTA_VERY_LONG, 1), 1);
         drain(new TokenBucket(FILL_DELTA_VERY_LONG, 10), 10);
@@ -62,6 +70,7 @@ public class TokenBucketTest extends TestCase {
         drain(new TokenBucket((int) DateUtils.DAY_IN_MILLIS, 200), 200);
     }
 
+    @Test
     public void testReset() {
         TokenBucket tb = new TokenBucket(FILL_DELTA_VERY_LONG, 100, 10);
         drain(tb, 10);
@@ -77,6 +86,7 @@ public class TokenBucketTest extends TestCase {
         drain(tb, 30);
     }
 
+    @Test
     public void testFill() throws Exception {
         int delta = 50;
         TokenBucket tb = new TokenBucket(delta, 10, 0);
@@ -88,6 +98,7 @@ public class TokenBucketTest extends TestCase {
         assertTrue(tb.has());
     }
 
+    @Test
     public void testRefill() throws Exception {
         TokenBucket tb = new TokenBucket(FILL_DELTA_VERY_SHORT, 10, 10);
 
@@ -107,6 +118,7 @@ public class TokenBucketTest extends TestCase {
         assertEquals(10, tb.get(100));
     }
 
+    @Test
     public void testAverage() throws Exception {
         final int delta = 3;
         final int want = 60;
@@ -124,6 +136,7 @@ public class TokenBucketTest extends TestCase {
         assertDuration(want * delta, SystemClock.elapsedRealtime() - start);
     }
 
+    @Test
     public void testBurst() throws Exception {
         final int delta = 2;
         final int capacity = 20;
diff --git a/core/tests/utiltests/Android.bp b/core/tests/utiltests/Android.bp
index 967047e74555..2ccee71c8ff7 100644
--- a/core/tests/utiltests/Android.bp
+++ b/core/tests/utiltests/Android.bp
@@ -54,21 +54,20 @@ android_test {
 
 android_ravenwood_test {
     name: "FrameworksUtilTestsRavenwood",
+    libs: [
+        "android.test.mock",
+    ],
     static_libs: [
         "androidx.annotation_annotation",
         "androidx.test.rules",
         "mockito_ravenwood",
+        "frameworks-base-testutils",
+        "servicestests-utils",
     ],
     srcs: [
-        "src/android/util/AtomicFileTest.java",
-        "src/android/util/DataUnitTest.java",
-        "src/android/util/EventLogTest.java",
-        "src/android/util/IndentingPrintWriterTest.java",
-        "src/android/util/IntArrayTest.java",
-        "src/android/util/LocalLogTest.java",
-        "src/android/util/LongArrayTest.java",
-        "src/android/util/SlogTest.java",
-        "src/android/util/TimeUtilsTest.java",
+        "src/android/util/IRemoteMemoryIntArray.aidl",
+        "src/android/util/**/*.java",
+        "src/com/android/internal/util/**/*.java",
     ],
     auto_gen_config: true,
 }
diff --git a/core/tests/utiltests/src/android/util/MemoryIntArrayTest.java b/core/tests/utiltests/src/android/util/MemoryIntArrayTest.java
index 1966e122ee5b..51013e4b4f00 100644
--- a/core/tests/utiltests/src/android/util/MemoryIntArrayTest.java
+++ b/core/tests/utiltests/src/android/util/MemoryIntArrayTest.java
@@ -23,11 +23,14 @@ import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 import android.os.Parcel;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 
-import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.runner.AndroidJUnit4;
 
 import libcore.io.IoUtils;
 
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -35,13 +38,17 @@ import java.lang.reflect.Field;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
-
-import androidx.test.ext.junit.runners.AndroidJUnit4;
 @RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = MemoryIntArray.class)
 public class MemoryIntArrayTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     static {
-        System.loadLibrary("cutils");
-        System.loadLibrary("memoryintarraytest");
+        if (!RavenwoodRule.isUnderRavenwood()) {
+            System.loadLibrary("cutils");
+            System.loadLibrary("memoryintarraytest");
+        }
     }
 
     @Test
diff --git a/core/tests/utiltests/src/android/util/MetadataReaderTest.java b/core/tests/utiltests/src/android/util/MetadataReaderTest.java
index a828edbac6ab..14feed8b89a1 100644
--- a/core/tests/utiltests/src/android/util/MetadataReaderTest.java
+++ b/core/tests/utiltests/src/android/util/MetadataReaderTest.java
@@ -16,37 +16,47 @@
 
 package android.util;
 
+import static org.junit.Assert.assertEquals;
+
 import android.media.ExifInterface;
 import android.os.Bundle;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 import android.provider.DocumentsContract;
 import android.provider.MetadataReader;
 
-import libcore.io.IoUtils;
+import androidx.test.runner.AndroidJUnit4;
 
-import junit.framework.TestCase;
+import libcore.io.IoUtils;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 
-public class MetadataReaderTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = MetadataReader.class)
+public class MetadataReaderTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
 
     private InputStream mInputStream;
     private Bundle mData;
 
     @Before
-    protected void setUp() throws Exception {
+    public void setUp() throws Exception {
         mInputStream = getClass().getClassLoader().getResourceAsStream("res/drawable/image.jpg");
         mData = new Bundle();
     }
 
     @After
-    protected void tearDown() throws Exception {
+    public void tearDown() throws Exception {
         IoUtils.closeQuietly(mInputStream);
     }
 
diff --git a/core/tests/utiltests/src/android/util/SystemConfigFileCommitEventLoggerTest.java b/core/tests/utiltests/src/android/util/SystemConfigFileCommitEventLoggerTest.java
index 5f6c20141c37..3bb79ec91d09 100644
--- a/core/tests/utiltests/src/android/util/SystemConfigFileCommitEventLoggerTest.java
+++ b/core/tests/utiltests/src/android/util/SystemConfigFileCommitEventLoggerTest.java
@@ -21,12 +21,22 @@ import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 
 import android.os.SystemClock;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.mockito.Mockito;
 
-
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = SystemConfigFileCommitEventLogger.class)
 public class SystemConfigFileCommitEventLoggerTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     @Test
     public void testSimple() throws Exception {
         var logger = spy(new SystemConfigFileCommitEventLogger("name"));
diff --git a/core/tests/utiltests/src/com/android/internal/util/ArrayUtilsTest.java b/core/tests/utiltests/src/com/android/internal/util/ArrayUtilsTest.java
index 72f3af640b67..0c5e9664bbde 100644
--- a/core/tests/utiltests/src/com/android/internal/util/ArrayUtilsTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/ArrayUtilsTest.java
@@ -17,19 +17,28 @@
 package com.android.internal.util;
 
 import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 
 import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 
-import junit.framework.TestCase;
-
 /**
  * Tests for {@link ArrayUtils}
  */
-public class ArrayUtilsTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class ArrayUtilsTest {
+    @Test
     public void testContains() throws Exception {
         final Object A = new Object();
         final Object B = new Object();
@@ -46,6 +55,7 @@ public class ArrayUtilsTest extends TestCase {
         assertFalse(ArrayUtils.contains(new Object[] { null }, A));
     }
 
+    @Test
     public void testIndexOf() throws Exception {
         final Object A = new Object();
         final Object B = new Object();
@@ -66,6 +76,7 @@ public class ArrayUtilsTest extends TestCase {
         assertEquals(2, ArrayUtils.indexOf(new Object[] { A, null, B }, B));
     }
 
+    @Test
     public void testContainsAll() throws Exception {
         final Object A = new Object();
         final Object B = new Object();
@@ -86,6 +97,7 @@ public class ArrayUtilsTest extends TestCase {
         assertFalse(ArrayUtils.containsAll(new Object[] { A }, new Object[] { null }));
     }
 
+    @Test
     public void testContainsInt() throws Exception {
         assertTrue(ArrayUtils.contains(new int[] { 1, 2, 3 }, 1));
         assertTrue(ArrayUtils.contains(new int[] { 1, 2, 3 }, 2));
@@ -96,6 +108,7 @@ public class ArrayUtilsTest extends TestCase {
         assertFalse(ArrayUtils.contains(new int[] { }, 2));
     }
 
+    @Test
     public void testAppendInt() throws Exception {
         assertArrayEquals(new int[] { 1 },
                 ArrayUtils.appendInt(null, 1));
@@ -107,6 +120,7 @@ public class ArrayUtilsTest extends TestCase {
                 ArrayUtils.appendInt(new int[] { 1, 2 }, 1));
     }
 
+    @Test
     public void testRemoveInt() throws Exception {
         assertNull(ArrayUtils.removeInt(null, 1));
         assertArrayEquals(new int[] { },
@@ -123,6 +137,7 @@ public class ArrayUtilsTest extends TestCase {
                 ArrayUtils.removeInt(new int[] { 1, 2, 3, 1 }, 1));
     }
 
+    @Test
     public void testContainsLong() throws Exception {
         assertTrue(ArrayUtils.contains(new long[] { 1, 2, 3 }, 1));
         assertTrue(ArrayUtils.contains(new long[] { 1, 2, 3 }, 2));
@@ -133,6 +148,7 @@ public class ArrayUtilsTest extends TestCase {
         assertFalse(ArrayUtils.contains(new long[] { }, 2));
     }
 
+    @Test
     public void testAppendLong() throws Exception {
         assertArrayEquals(new long[] { 1 },
                 ArrayUtils.appendLong(null, 1));
@@ -144,6 +160,7 @@ public class ArrayUtilsTest extends TestCase {
                 ArrayUtils.appendLong(new long[] { 1, 2 }, 1));
     }
 
+    @Test
     public void testRemoveLong() throws Exception {
         assertNull(ArrayUtils.removeLong(null, 1));
         assertArrayEquals(new long[] { },
@@ -160,6 +177,7 @@ public class ArrayUtilsTest extends TestCase {
                 ArrayUtils.removeLong(new long[] { 1, 2, 3, 1 }, 1));
     }
 
+    @Test
     public void testConcat_zeroObjectArrays() {
         // empty varargs array
         assertArrayEquals(new String[] {}, ArrayUtils.concat(String.class));
@@ -167,16 +185,19 @@ public class ArrayUtilsTest extends TestCase {
         assertArrayEquals(new String[] {}, ArrayUtils.concat(String.class, (String[][]) null));
     }
 
+    @Test
     public void testConcat_oneObjectArray() {
         assertArrayEquals(new String[] { "1", "2" },
                 ArrayUtils.concat(String.class, new String[] { "1", "2" }));
     }
 
+    @Test
     public void testConcat_oneEmptyObjectArray() {
         assertArrayEquals(new String[] {}, ArrayUtils.concat(String.class, (String[]) null));
         assertArrayEquals(new String[] {}, ArrayUtils.concat(String.class, new String[] {}));
     }
 
+    @Test
     public void testConcat_twoObjectArrays() {
         assertArrayEquals(new Long[] { 1L },
                 ArrayUtils.concat(Long.class, new Long[] { 1L }, new Long[] {}));
@@ -188,6 +209,7 @@ public class ArrayUtilsTest extends TestCase {
                 ArrayUtils.concat(Long.class, new Long[] { 1L, 2L }, new Long[] { 3L, 4L }));
     }
 
+    @Test
     public void testConcat_twoEmptyObjectArrays() {
         assertArrayEquals(new Long[] {}, ArrayUtils.concat(Long.class, null, null));
         assertArrayEquals(new Long[] {}, ArrayUtils.concat(Long.class, new Long[] {}, null));
@@ -196,6 +218,7 @@ public class ArrayUtilsTest extends TestCase {
                 ArrayUtils.concat(Long.class, new Long[] {}, new Long[] {}));
     }
 
+    @Test
     public void testConcat_threeObjectArrays() {
         String[] array1 = { "1", "2" };
         String[] array2 = { "3", "4" };
@@ -205,6 +228,7 @@ public class ArrayUtilsTest extends TestCase {
         assertArrayEquals(expectation, ArrayUtils.concat(String.class, array1, array2, array3));
     }
 
+    @Test
     public void testConcat_threeObjectArraysWithNull() {
         String[] array1 = { "1", "2" };
         String[] array2 = null;
@@ -214,6 +238,7 @@ public class ArrayUtilsTest extends TestCase {
         assertArrayEquals(expectation, ArrayUtils.concat(String.class, array1, array2, array3));
     }
 
+    @Test
     public void testConcat_zeroByteArrays() {
         // empty varargs array
         assertArrayEquals(new byte[] {}, ArrayUtils.concat());
@@ -221,15 +246,18 @@ public class ArrayUtilsTest extends TestCase {
         assertArrayEquals(new byte[] {}, ArrayUtils.concat((byte[][]) null));
     }
 
+    @Test
     public void testConcat_oneByteArray() {
         assertArrayEquals(new byte[] { 1, 2 }, ArrayUtils.concat(new byte[] { 1, 2 }));
     }
 
+    @Test
     public void testConcat_oneEmptyByteArray() {
         assertArrayEquals(new byte[] {}, ArrayUtils.concat((byte[]) null));
         assertArrayEquals(new byte[] {}, ArrayUtils.concat(new byte[] {}));
     }
 
+    @Test
     public void testConcat_twoByteArrays() {
         assertArrayEquals(new byte[] { 1 }, ArrayUtils.concat(new byte[] { 1 }, new byte[] {}));
         assertArrayEquals(new byte[] { 1 }, ArrayUtils.concat(new byte[] {}, new byte[] { 1 }));
@@ -239,6 +267,7 @@ public class ArrayUtilsTest extends TestCase {
                 ArrayUtils.concat(new byte[] { 1, 2 }, new byte[] { 3, 4 }));
     }
 
+    @Test
     public void testConcat_twoEmptyByteArrays() {
         assertArrayEquals(new byte[] {}, ArrayUtils.concat((byte[]) null, null));
         assertArrayEquals(new byte[] {}, ArrayUtils.concat(new byte[] {}, null));
@@ -246,6 +275,7 @@ public class ArrayUtilsTest extends TestCase {
         assertArrayEquals(new byte[] {}, ArrayUtils.concat(new byte[] {}, new byte[] {}));
     }
 
+    @Test
     public void testConcat_threeByteArrays() {
         byte[] array1 = { 1, 2 };
         byte[] array2 = { 3, 4 };
@@ -255,6 +285,7 @@ public class ArrayUtilsTest extends TestCase {
         assertArrayEquals(expectation, ArrayUtils.concat(array1, array2, array3));
     }
 
+    @Test
     public void testConcat_threeByteArraysWithNull() {
         byte[] array1 = { 1, 2 };
         byte[] array2 = null;
@@ -264,6 +295,7 @@ public class ArrayUtilsTest extends TestCase {
         assertArrayEquals(expectation, ArrayUtils.concat(array1, array2, array3));
     }
 
+    @Test
     @SmallTest
     public void testUnstableRemoveIf() throws Exception {
         java.util.function.Predicate<Object> isNull = new java.util.function.Predicate<Object>() {
@@ -357,31 +389,37 @@ public class ArrayUtilsTest extends TestCase {
         assertEquals(0, collection.size());
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_passesWhenRangeInsideArray() {
         ArrayUtils.throwsIfOutOfBounds(10, 2, 6);
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_passesWhenRangeIsWholeArray() {
         ArrayUtils.throwsIfOutOfBounds(10, 0, 10);
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_passesWhenEmptyRangeAtStart() {
         ArrayUtils.throwsIfOutOfBounds(10, 0, 0);
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_passesWhenEmptyRangeAtEnd() {
         ArrayUtils.throwsIfOutOfBounds(10, 10, 0);
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_passesWhenEmptyArray() {
         ArrayUtils.throwsIfOutOfBounds(0, 0, 0);
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_failsWhenRangeStartNegative() {
         try {
@@ -392,6 +430,7 @@ public class ArrayUtilsTest extends TestCase {
         }
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_failsWhenCountNegative() {
         try {
@@ -402,6 +441,7 @@ public class ArrayUtilsTest extends TestCase {
         }
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_failsWhenRangeStartTooHigh() {
         try {
@@ -412,6 +452,7 @@ public class ArrayUtilsTest extends TestCase {
         }
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_failsWhenRangeEndTooHigh() {
         try {
@@ -422,6 +463,7 @@ public class ArrayUtilsTest extends TestCase {
         }
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_failsWhenLengthNegative() {
         try {
@@ -432,6 +474,7 @@ public class ArrayUtilsTest extends TestCase {
         }
     }
 
+    @Test
     @SmallTest
     public void testThrowsIfOutOfBounds_failsWhenOverflowRangeEndTooHigh() {
         try {
diff --git a/core/tests/utiltests/src/com/android/internal/util/BitwiseStreamsTest.java b/core/tests/utiltests/src/com/android/internal/util/BitwiseStreamsTest.java
index 306f58fcce2e..092d6999e85e 100644
--- a/core/tests/utiltests/src/com/android/internal/util/BitwiseStreamsTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/BitwiseStreamsTest.java
@@ -16,20 +16,23 @@
 
 package com.android.internal.util;
 
-import com.android.internal.util.BitwiseInputStream;
-import com.android.internal.util.BitwiseOutputStream;
-import com.android.internal.util.HexDump;
-
-import android.test.AndroidTestCase;
-import android.test.suitebuilder.annotation.SmallTest;
+import static org.junit.Assert.assertEquals;
 
 import android.util.Log;
 
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
 import java.util.Random;
 
-public class BitwiseStreamsTest extends AndroidTestCase {
+@RunWith(AndroidJUnit4.class)
+public class BitwiseStreamsTest {
     private final static String LOG_TAG = "BitwiseStreamsTest";
 
+    @Test
     @SmallTest
     public void testOne() throws Exception {
         int offset = 3;
@@ -45,6 +48,7 @@ public class BitwiseStreamsTest extends AndroidTestCase {
         assertEquals(HexDump.toHexString(inBuf), HexDump.toHexString(inBufDup));
     }
 
+    @Test
     @SmallTest
     public void testTwo() throws Exception {
         int offset = 3;
@@ -59,6 +63,7 @@ public class BitwiseStreamsTest extends AndroidTestCase {
         assertEquals(HexDump.toHexString(inBuf), HexDump.toHexString(inBufDup));
     }
 
+    @Test
     @SmallTest
     public void testThree() throws Exception {
         int offset = 4;
@@ -73,6 +78,7 @@ public class BitwiseStreamsTest extends AndroidTestCase {
         assertEquals(HexDump.toHexString(inBuf), HexDump.toHexString(inBufDup));
     }
 
+    @Test
     @SmallTest
     public void testFour() throws Exception {
         int offset = 7;
@@ -90,6 +96,7 @@ public class BitwiseStreamsTest extends AndroidTestCase {
         assertEquals(HexDump.toHexString(inBuf), HexDump.toHexString(inBufDup));
     }
 
+    @Test
     @SmallTest
     public void testFive() throws Exception {
         Random random = new Random();
@@ -111,6 +118,7 @@ public class BitwiseStreamsTest extends AndroidTestCase {
         }
     }
 
+    @Test
     @SmallTest
     public void testSix() throws Exception {
         int num_runs = 10;
@@ -134,6 +142,7 @@ public class BitwiseStreamsTest extends AndroidTestCase {
         Log.d(LOG_TAG, "repeated encode-decode took " + (end - start) + " ms");
     }
 
+    @Test
     @SmallTest
     public void testExpandArray() throws Exception {
         Random random = new Random();
diff --git a/core/tests/utiltests/src/com/android/internal/util/CallbackRegistryTest.java b/core/tests/utiltests/src/com/android/internal/util/CallbackRegistryTest.java
index 1581abb5a9c6..9a1402e04011 100644
--- a/core/tests/utiltests/src/com/android/internal/util/CallbackRegistryTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/CallbackRegistryTest.java
@@ -15,19 +15,21 @@
  */
 package com.android.internal.util;
 
-import junit.framework.TestCase;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import androidx.test.runner.AndroidJUnit4;
 
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.ArrayList;
 import java.util.Objects;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
-
-public class CallbackRegistryTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class CallbackRegistryTest {
 
     final Integer callback1 = 1;
     final Integer callback2 = 2;
@@ -50,6 +52,7 @@ public class CallbackRegistryTest extends TestCase {
         deepNotifyCount[callback]++;
     }
 
+    @Test
     public void testAddListener() {
         CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer> notifier =
                 new CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer>() {
@@ -89,6 +92,7 @@ public class CallbackRegistryTest extends TestCase {
         assertEquals(otherListener, callbacks.get(0));
     }
 
+    @Test
     public void testSimpleNotify() {
         CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer> notifier =
                 new CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer>() {
@@ -108,6 +112,7 @@ public class CallbackRegistryTest extends TestCase {
         assertEquals(1, notify2);
     }
 
+    @Test
     public void testRemoveWhileNotifying() {
         CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer> notifier =
                 new CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer>() {
@@ -135,6 +140,7 @@ public class CallbackRegistryTest extends TestCase {
         assertEquals(callback3, callbacks.get(0));
     }
 
+    @Test
     public void testDeepRemoveWhileNotifying() {
         CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer> notifier =
                 new CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer>() {
@@ -159,6 +165,7 @@ public class CallbackRegistryTest extends TestCase {
         assertEquals(0, callbacks.size());
     }
 
+    @Test
     public void testAddRemovedListener() {
 
         CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer> notifier =
@@ -191,6 +198,7 @@ public class CallbackRegistryTest extends TestCase {
         assertEquals(1, notify3);
     }
 
+    @Test
     public void testVeryDeepRemoveWhileNotifying() {
         final Integer[] callbacks = new Integer[deepNotifyCount.length];
         for (int i = 0; i < callbacks.length; i++) {
@@ -221,6 +229,7 @@ public class CallbackRegistryTest extends TestCase {
         assertEquals(0, callbackList.size());
     }
 
+    @Test
     public void testClear() {
         CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer> notifier =
                 new CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer>() {
@@ -245,6 +254,7 @@ public class CallbackRegistryTest extends TestCase {
         }
     }
 
+    @Test
     public void testNestedClear() {
         CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer> notifier =
                 new CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer>() {
@@ -268,6 +278,7 @@ public class CallbackRegistryTest extends TestCase {
         assertEquals(0, callbackList.size());
     }
 
+    @Test
     public void testIsEmpty() throws Exception {
         CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer> notifier =
                 new CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer>() {
@@ -284,6 +295,7 @@ public class CallbackRegistryTest extends TestCase {
         assertFalse(registry.isEmpty());
     }
 
+    @Test
     public void testClone() throws Exception {
         CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer> notifier =
                 new CallbackRegistry.NotifierCallback<Integer, CallbackRegistryTest, Integer>() {
diff --git a/core/tests/utiltests/src/com/android/internal/util/CharSequencesTest.java b/core/tests/utiltests/src/com/android/internal/util/CharSequencesTest.java
index 469a4ccd05e4..988854038e53 100644
--- a/core/tests/utiltests/src/com/android/internal/util/CharSequencesTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/CharSequencesTest.java
@@ -18,12 +18,26 @@ package com.android.internal.util;
 
 import static com.android.internal.util.CharSequences.forAsciiBytes;
 
-import android.test.suitebuilder.annotation.SmallTest;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 
-import junit.framework.TestCase;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 
-public class CharSequencesTest extends TestCase {
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = CharSequences.class)
+public class CharSequencesTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
+    @Test
     @SmallTest
     public void testCharSequences() {
         String s = "Hello Bob";
diff --git a/core/tests/utiltests/src/com/android/internal/util/FastXmlSerializerTest.java b/core/tests/utiltests/src/com/android/internal/util/FastXmlSerializerTest.java
index 3cef33621a01..7723d589a723 100644
--- a/core/tests/utiltests/src/com/android/internal/util/FastXmlSerializerTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/FastXmlSerializerTest.java
@@ -16,13 +16,23 @@
 
 package com.android.internal.util;
 
-import android.test.suitebuilder.annotation.LargeTest;
-import android.test.suitebuilder.annotation.SmallTest;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
+import android.provider.DeviceConfig;
 import android.util.Log;
 import android.util.Xml;
 
-import junit.framework.TestCase;
+import androidx.test.filters.LargeTest;
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlSerializer;
 
@@ -34,7 +44,9 @@ import java.nio.charset.StandardCharsets;
  * Tests for {@link FastXmlSerializer}
  */
 @SmallTest
-public class FastXmlSerializerTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = Xml.class)
+public class FastXmlSerializerTest {
     private static final String TAG = "FastXmlSerializerTest";
 
     private static final boolean ENABLE_DUMP = false; // DO NOT SUBMIT WITH TRUE.
@@ -42,6 +54,10 @@ public class FastXmlSerializerTest extends TestCase {
     private static final String ROOT_TAG = "root";
     private static final String ATTR = "attr";
 
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
+    @Test
     public void testEmptyText() throws Exception {
         final ByteArrayOutputStream stream = new ByteArrayOutputStream();
 
@@ -128,6 +144,7 @@ public class FastXmlSerializerTest extends TestCase {
         return ok;
     }
 
+    @Test
     @LargeTest
     public void testAllCharacters() throws Exception {
         boolean ok = true;
diff --git a/core/tests/utiltests/src/com/android/internal/util/FileRotatorTest.java b/core/tests/utiltests/src/com/android/internal/util/FileRotatorTest.java
index 73e47e1635b4..47c17959d28d 100644
--- a/core/tests/utiltests/src/com/android/internal/util/FileRotatorTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/FileRotatorTest.java
@@ -23,16 +23,23 @@ import static android.text.format.DateUtils.SECOND_IN_MILLIS;
 import static android.text.format.DateUtils.WEEK_IN_MILLIS;
 import static android.text.format.DateUtils.YEAR_IN_MILLIS;
 
-import android.test.AndroidTestCase;
-import android.test.suitebuilder.annotation.Suppress;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
 import android.util.Log;
 
+import androidx.test.runner.AndroidJUnit4;
+
 import com.android.internal.util.FileRotator.Reader;
 import com.android.internal.util.FileRotator.Writer;
-import com.android.internal.util.test.FsUtil;
 
 import com.google.android.collect.Lists;
 
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.File;
@@ -40,6 +47,7 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Random;
@@ -47,7 +55,8 @@ import java.util.Random;
 /**
  * Tests for {@link FileRotator}.
  */
-public class FileRotatorTest extends AndroidTestCase {
+@RunWith(AndroidJUnit4.class)
+public class FileRotatorTest {
     private static final String TAG = "FileRotatorTest";
 
     private File mBasePath;
@@ -59,14 +68,12 @@ public class FileRotatorTest extends AndroidTestCase {
 
     // TODO: test throwing rolls back correctly
 
-    @Override
-    protected void setUp() throws Exception {
-        super.setUp();
-
-        mBasePath = getContext().getFilesDir();
-        FsUtil.deleteContents(mBasePath);
+    @Before
+    public void setUp() throws Exception {
+        mBasePath = Files.createTempDirectory(TAG).toFile();
     }
 
+    @Test
     public void testEmpty() throws Exception {
         final FileRotator rotate1 = new FileRotator(
                 mBasePath, PREFIX, DAY_IN_MILLIS, WEEK_IN_MILLIS);
@@ -85,6 +92,7 @@ public class FileRotatorTest extends AndroidTestCase {
         assertReadAll(rotate2);
     }
 
+    @Test
     public void testCombine() throws Exception {
         final FileRotator rotate = new FileRotator(
                 mBasePath, PREFIX, DAY_IN_MILLIS, WEEK_IN_MILLIS);
@@ -106,6 +114,7 @@ public class FileRotatorTest extends AndroidTestCase {
         assertReadAll(rotate, "bar");
     }
 
+    @Test
     public void testRotate() throws Exception {
         final FileRotator rotate = new FileRotator(
                 mBasePath, PREFIX, DAY_IN_MILLIS, WEEK_IN_MILLIS);
@@ -138,6 +147,7 @@ public class FileRotatorTest extends AndroidTestCase {
         assertReadAll(rotate, "bar", "baz");
     }
 
+    @Test
     public void testDelete() throws Exception {
         final FileRotator rotate = new FileRotator(
                 mBasePath, PREFIX, MINUTE_IN_MILLIS, DAY_IN_MILLIS);
@@ -168,6 +178,7 @@ public class FileRotatorTest extends AndroidTestCase {
         assertReadAll(rotate);
     }
 
+    @Test
     public void testThrowRestoresBackup() throws Exception {
         final FileRotator rotate = new FileRotator(
                 mBasePath, PREFIX, MINUTE_IN_MILLIS, DAY_IN_MILLIS);
@@ -201,6 +212,7 @@ public class FileRotatorTest extends AndroidTestCase {
         assertReadAll(rotate, "foo");
     }
 
+    @Test
     public void testOtherFilesAndMalformed() throws Exception {
         final FileRotator rotate = new FileRotator(
                 mBasePath, PREFIX, SECOND_IN_MILLIS, SECOND_IN_MILLIS);
@@ -229,6 +241,7 @@ public class FileRotatorTest extends AndroidTestCase {
     private static final String BLUE = "blue";
     private static final String YELLOW = "yellow";
 
+    @Test
     public void testQueryMatch() throws Exception {
         final FileRotator rotate = new FileRotator(
                 mBasePath, PREFIX, HOUR_IN_MILLIS, YEAR_IN_MILLIS);
@@ -277,6 +290,7 @@ public class FileRotatorTest extends AndroidTestCase {
         assertReadMatching(rotate, Long.MIN_VALUE, TEST_TIME - DAY_IN_MILLIS);
     }
 
+    @Test
     public void testClockRollingBackwards() throws Exception {
         final FileRotator rotate = new FileRotator(
                 mBasePath, PREFIX, DAY_IN_MILLIS, YEAR_IN_MILLIS);
@@ -325,7 +339,8 @@ public class FileRotatorTest extends AndroidTestCase {
         assertReadAll(rotate, "meow", "yay");
     }
 
-    @Suppress
+    @Test
+    @Ignore
     public void testFuzz() throws Exception {
         final FileRotator rotate = new FileRotator(
                 mBasePath, PREFIX, HOUR_IN_MILLIS, DAY_IN_MILLIS);
@@ -352,6 +367,7 @@ public class FileRotatorTest extends AndroidTestCase {
         Log.d(TAG, Arrays.toString(mBasePath.list()));
     }
 
+    @Test
     public void testRecoverAtomic() throws Exception {
         write("rotator.1024-2048", "foo");
         write("rotator.1024-2048.backup", "bar");
@@ -366,6 +382,7 @@ public class FileRotatorTest extends AndroidTestCase {
         assertReadAll(rotate, "bar");
     }
 
+    @Test
     public void testReadSorted() throws Exception {
         write("rotator.1024-2048", "2");
         write("rotator.2048-4096", "3");
@@ -376,11 +393,11 @@ public class FileRotatorTest extends AndroidTestCase {
         assertReadAll(rotate, "1", "2", "3");
     }
 
+    @Test
     public void testFileSystemInaccessible() throws Exception {
-        File inaccessibleDir = null;
-        String dirPath = getContext().getFilesDir() + File.separator + "inaccessible";
-        inaccessibleDir = new File(dirPath);
-        final FileRotator rotate = new FileRotator(inaccessibleDir, PREFIX, SECOND_IN_MILLIS, SECOND_IN_MILLIS);
+        File inaccessibleDir = mBasePath.toPath().resolve("does_not_exist").toFile();
+        final FileRotator rotate = new FileRotator(inaccessibleDir, PREFIX,
+                SECOND_IN_MILLIS, SECOND_IN_MILLIS);
 
         // rotate should not throw on dir not mkdir-ed (or otherwise inaccessible)
         rotate.maybeRotate(TEST_TIME);
diff --git a/core/tests/utiltests/src/com/android/internal/util/HeavyHitterSketchTest.java b/core/tests/utiltests/src/com/android/internal/util/HeavyHitterSketchTest.java
index f2285a12e30a..74184cacc91c 100644
--- a/core/tests/utiltests/src/com/android/internal/util/HeavyHitterSketchTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/HeavyHitterSketchTest.java
@@ -16,10 +16,17 @@
 
 package com.android.internal.util;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 import android.util.ArraySet;
 import android.util.Pair;
 
-import junit.framework.TestCase;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.ArrayList;
 import java.util.Comparator;
@@ -32,7 +39,8 @@ import java.util.stream.Collectors;
 /**
  * Tests for {@link HeavyHitterSketch}.
  */
-public final class HeavyHitterSketchTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public final class HeavyHitterSketchTest {
 
     private static final float EPSILON = 0.00001f;
 
@@ -163,6 +171,7 @@ public final class HeavyHitterSketchTest extends TestCase {
         return input;
     }
 
+    @Test
     public void testPositive() throws Exception {
         // Simple case
         verify(new int[]{2, 9, 9, 9, 7, 6, 4, 9, 9, 9, 3, 9}, 2, new int[]{9},
@@ -179,6 +188,7 @@ public final class HeavyHitterSketchTest extends TestCase {
                 new float[]{0.32f, 0.24f, 0.16f, 0.08f});
     }
 
+    @Test
     public void testNegative() throws Exception {
         // Simple case
         verifyNotExpected(new int[]{2, 9, 9, 9, 7, 6, 4, 9, 9, 9, 3, 9}, 2, new int[]{0, 1, 2});
@@ -193,6 +203,7 @@ public final class HeavyHitterSketchTest extends TestCase {
         verifyNotExpected(input, 12, new int[]{0, 1, 2, 1000, 1005});
     }
 
+    @Test
     public void testFalsePositive() throws Exception {
         // Simple case
         verifyNotExpected(new int[]{2, 9, 2, 2, 7, 6, 4, 9, 9, 9, 3, 9}, 2, new int[]{9});
diff --git a/core/tests/utiltests/src/com/android/internal/util/InlinePresentationStyleUtilsTest.java b/core/tests/utiltests/src/com/android/internal/util/InlinePresentationStyleUtilsTest.java
index 35c56818a108..7203b8c6a8c8 100644
--- a/core/tests/utiltests/src/com/android/internal/util/InlinePresentationStyleUtilsTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/InlinePresentationStyleUtilsTest.java
@@ -22,20 +22,28 @@ import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
+import android.graphics.Color;
 import android.os.Binder;
 import android.os.Bundle;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
 import com.android.internal.widget.InlinePresentationStyleUtils;
 
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
 @RunWith(AndroidJUnit4.class)
 @SmallTest
+@IgnoreUnderRavenwood(blockedBy = InlinePresentationStyleUtils.class)
 public class InlinePresentationStyleUtilsTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     @Test
     public void testBundleEquals_empty() {
         Bundle bundle1 = new Bundle();
diff --git a/core/tests/utiltests/src/com/android/internal/util/LockPatternUtilsTest.java b/core/tests/utiltests/src/com/android/internal/util/LockPatternUtilsTest.java
index 0b7019995acb..0df5b0a4093e 100644
--- a/core/tests/utiltests/src/com/android/internal/util/LockPatternUtilsTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/LockPatternUtilsTest.java
@@ -43,6 +43,8 @@ import android.content.pm.UserInfo;
 import android.os.Looper;
 import android.os.RemoteException;
 import android.os.UserManager;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 import android.provider.Settings;
 import android.test.mock.MockContentResolver;
 
@@ -58,6 +60,7 @@ import com.android.internal.widget.LockPatternUtils;
 
 import com.google.android.collect.Lists;
 
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.ArgumentCaptor;
@@ -68,7 +71,10 @@ import java.util.List;
 
 @RunWith(AndroidJUnit4.class)
 @SmallTest
+@IgnoreUnderRavenwood(blockedBy = LockPatternUtils.class)
 public class LockPatternUtilsTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
 
     private static final int DEMO_USER_ID = 5;
 
diff --git a/core/tests/utiltests/src/com/android/internal/util/MessageUtilsTest.java b/core/tests/utiltests/src/com/android/internal/util/MessageUtilsTest.java
index 32b969a8d1b5..36f238e7429c 100644
--- a/core/tests/utiltests/src/com/android/internal/util/MessageUtilsTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/MessageUtilsTest.java
@@ -19,10 +19,13 @@ package com.android.internal.util;
 import static org.junit.Assert.*;
 
 import com.android.internal.util.MessageUtils;
-import android.test.suitebuilder.annotation.SmallTest;
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
 import android.util.SparseArray;
 
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
 
 class A {
@@ -48,6 +51,7 @@ class B {
  * Unit tests for {@link com.android.util.MessageUtils}.
  */
 @SmallTest
+@RunWith(AndroidJUnit4.class)
 public class MessageUtilsTest {
 
     private static final Class[] CLASSES = { A.class, B.class };
diff --git a/core/tests/utiltests/src/com/android/internal/util/MimeIconUtilsTest.java b/core/tests/utiltests/src/com/android/internal/util/MimeIconUtilsTest.java
index 4412c2c6949c..6c3479722526 100644
--- a/core/tests/utiltests/src/com/android/internal/util/MimeIconUtilsTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/MimeIconUtilsTest.java
@@ -16,12 +16,27 @@
 
 package com.android.internal.util;
 
-import junit.framework.TestCase;
+import static org.junit.Assert.assertEquals;
+
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 /**
  * Tests for {@link MimeIconUtils}.
  */
-public class MimeIconUtilsTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = MimeIconUtils.class)
+public class MimeIconUtilsTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
+    @Test
     public void testSimple() throws Exception {
         assertEquals("PNG image",
                 MimeIconUtils.getTypeInfo("image/png").getLabel());
diff --git a/core/tests/utiltests/src/com/android/internal/util/ObjectUtilsTest.java b/core/tests/utiltests/src/com/android/internal/util/ObjectUtilsTest.java
index 443183eeba4d..4eaacfffd433 100644
--- a/core/tests/utiltests/src/com/android/internal/util/ObjectUtilsTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/ObjectUtilsTest.java
@@ -15,11 +15,18 @@
  */
 package com.android.internal.util;
 
-import android.test.AndroidTestCase;
-import android.test.suitebuilder.annotation.SmallTest;
+import static org.junit.Assert.assertEquals;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 @SmallTest
-public class ObjectUtilsTest extends AndroidTestCase {
+@RunWith(AndroidJUnit4.class)
+public class ObjectUtilsTest {
+    @Test
     public void testCompare() {
         assertEquals(0, ObjectUtils.compare(null, null));
         assertEquals(1, ObjectUtils.compare("a", null));
diff --git a/core/tests/utiltests/src/com/android/internal/util/ObservableServiceConnectionTest.java b/core/tests/utiltests/src/com/android/internal/util/ObservableServiceConnectionTest.java
index d124ad9ddfb0..c852e9f17bc0 100644
--- a/core/tests/utiltests/src/com/android/internal/util/ObservableServiceConnectionTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/ObservableServiceConnectionTest.java
@@ -29,14 +29,19 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.os.IBinder;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 
 import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
 import com.android.internal.util.ObservableServiceConnection.ServiceTransformer;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
@@ -46,7 +51,12 @@ import java.util.Queue;
 import java.util.concurrent.Executor;
 
 @SmallTest
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = ObservableServiceConnection.class)
 public class ObservableServiceConnectionTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     private static final ComponentName COMPONENT_NAME =
             new ComponentName("test.package", "component");
 
diff --git a/core/tests/utiltests/src/com/android/internal/util/PersistentServiceConnectionTest.java b/core/tests/utiltests/src/com/android/internal/util/PersistentServiceConnectionTest.java
index fee46545ac62..096f303247ff 100644
--- a/core/tests/utiltests/src/com/android/internal/util/PersistentServiceConnectionTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/PersistentServiceConnectionTest.java
@@ -30,6 +30,10 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.os.IBinder;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
+
+import androidx.test.runner.AndroidJUnit4;
 
 import com.android.internal.util.ObservableServiceConnection.ServiceTransformer;
 import com.android.server.testutils.OffsettableClock;
@@ -37,7 +41,9 @@ import com.android.server.testutils.TestHandler;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
@@ -45,7 +51,12 @@ import java.util.ArrayDeque;
 import java.util.Queue;
 import java.util.concurrent.Executor;
 
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = PersistentServiceConnection.class)
 public class PersistentServiceConnectionTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
+
     private static final ComponentName COMPONENT_NAME =
             new ComponentName("test.package", "component");
     private static final int MAX_RETRIES = 2;
diff --git a/core/tests/utiltests/src/com/android/internal/util/ProcFileReaderTest.java b/core/tests/utiltests/src/com/android/internal/util/ProcFileReaderTest.java
index b93276053caf..4c00c1667e3c 100644
--- a/core/tests/utiltests/src/com/android/internal/util/ProcFileReaderTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/ProcFileReaderTest.java
@@ -16,7 +16,15 @@
 
 package com.android.internal.util;
 
-import android.test.AndroidTestCase;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.io.ByteArrayInputStream;
 import java.io.File;
@@ -28,8 +36,10 @@ import java.nio.file.Files;
 /**
  * Tests for {@link ProcFileReader}.
  */
-public class ProcFileReaderTest extends AndroidTestCase {
+@RunWith(AndroidJUnit4.class)
+public class ProcFileReaderTest {
 
+    @Test
     public void testEmpty() throws Exception {
         final ProcFileReader reader = buildReader("");
 
@@ -43,6 +53,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertFalse(reader.hasMoreData());
     }
 
+    @Test
     public void testSingleString() throws Exception {
         final ProcFileReader reader = buildReader("a\nb\nc\n");
 
@@ -59,6 +70,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertFalse(reader.hasMoreData());
     }
 
+    @Test
     public void testMixedNumbersSkip() throws Exception {
         final ProcFileReader reader = buildReader("1 2 3\n4 abc_def 5 6 7 8 9\n10\n");
 
@@ -79,6 +91,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertFalse(reader.hasMoreData());
     }
 
+    @Test
     public void testBufferSize() throws Exception {
         // read numbers using very small buffer size, exercising fillBuf()
         final ProcFileReader reader = buildReader("1 21 3 41 5 61 7 81 9 10\n", 3);
@@ -97,6 +110,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertFalse(reader.hasMoreData());
     }
 
+    @Test
     public void testBlankLines() throws Exception {
         final ProcFileReader reader = buildReader("1\n\n2\n\n3\n");
 
@@ -117,6 +131,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertFalse(reader.hasMoreData());
     }
 
+    @Test
     public void testMinMax() throws Exception {
         final ProcFileReader reader = buildReader(
                 "1 -1024 9223372036854775807 -9223372036854775808\n");
@@ -129,6 +144,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertFalse(reader.hasMoreData());
     }
 
+    @Test
     public void testDelimiterNeverFound() throws Exception {
         final ProcFileReader reader = buildReader("teststringwithoutdelimiters");
 
@@ -141,6 +157,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         }
     }
 
+    @Test
     public void testLargerThanBuffer() throws Exception {
         // try finishing line larger than buffer
         final ProcFileReader reader = buildReader("1 teststringlongerthanbuffer\n", 4);
@@ -155,6 +172,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         }
     }
 
+    @Test
     public void testOptionalLongs() throws Exception {
         final ProcFileReader reader = buildReader("123 456\n789\n");
 
@@ -169,6 +187,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertEquals(-1L, reader.nextOptionalLong(-1L));
     }
 
+    @Test
     public void testInvalidLongs() throws Exception {
         final ProcFileReader reader = buildReader("12: 34\n56 78@#\n");
 
@@ -183,6 +202,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertFalse(reader.hasMoreData());
     }
 
+    @Test
     public void testConsecutiveDelimiters() throws Exception {
         final ProcFileReader reader = buildReader("1 2  3   4     5\n");
 
@@ -195,6 +215,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertFalse(reader.hasMoreData());
     }
 
+    @Test
     public void testIgnore() throws Exception {
         final ProcFileReader reader = buildReader("a b c\n");
 
@@ -209,6 +230,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertFalse(reader.hasMoreData());
     }
 
+    @Test
     public void testRewind() throws Exception {
         final ProcFileReader reader = buildReader("abc\n");
 
@@ -224,7 +246,7 @@ public class ProcFileReaderTest extends AndroidTestCase {
         assertFalse(reader.hasMoreData());
     }
 
-
+    @Test
     public void testRewindFileInputStream() throws Exception {
         File tempFile = File.createTempFile("procfile", null, null);
         Files.write(tempFile.toPath(), "abc\n".getBytes(StandardCharsets.US_ASCII));
diff --git a/core/tests/utiltests/src/com/android/internal/util/QuickSelectTest.java b/core/tests/utiltests/src/com/android/internal/util/QuickSelectTest.java
index 1b9d2ef58c10..1eb5e3ab7d6c 100644
--- a/core/tests/utiltests/src/com/android/internal/util/QuickSelectTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/QuickSelectTest.java
@@ -16,7 +16,12 @@
 
 package com.android.internal.util;
 
-import junit.framework.TestCase;
+import static org.junit.Assert.assertEquals;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.Arrays;
 import java.util.List;
@@ -24,8 +29,10 @@ import java.util.List;
 /**
  * Tests for {@link QuickSelect}.
  */
-public final class QuickSelectTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class QuickSelectTest {
 
+    @Test
     public void testQuickSelect() throws Exception {
         test((List<Integer>) null, 0, null);
         test(Arrays.asList(), -1, null);
diff --git a/core/tests/utiltests/src/com/android/internal/util/StringPoolTest.java b/core/tests/utiltests/src/com/android/internal/util/StringPoolTest.java
index f67fd516fcf6..6523ed7fabb7 100644
--- a/core/tests/utiltests/src/com/android/internal/util/StringPoolTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/StringPoolTest.java
@@ -16,12 +16,21 @@
 
 package com.android.internal.util;
 
-import android.test.AndroidTestCase;
-import android.test.suitebuilder.annotation.SmallTest;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertSame;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 @SmallTest
-public final class StringPoolTest extends AndroidTestCase {
+@RunWith(AndroidJUnit4.class)
+public final class StringPoolTest {
 
+    @Test
     public void testStringPool() {
         StringPool stringPool = new StringPool();
         String bcd = stringPool.get(new char[] { 'a', 'b', 'c', 'd', 'e' }, 1, 3);
@@ -29,6 +38,7 @@ public final class StringPoolTest extends AndroidTestCase {
         assertSame(bcd, stringPool.get(new char[] { 'a', 'b', 'c', 'd', 'e' }, 1, 3));
     }
 
+    @Test
     public void testHashCollision() {
         StringPool stringPool = new StringPool();
         char[] a = { (char) 1, (char) 0 };
diff --git a/core/tests/utiltests/src/com/android/internal/util/WakeupMessageTest.java b/core/tests/utiltests/src/com/android/internal/util/WakeupMessageTest.java
index 734ebef0007e..b0db8a1da3a8 100644
--- a/core/tests/utiltests/src/com/android/internal/util/WakeupMessageTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/WakeupMessageTest.java
@@ -24,11 +24,17 @@ import android.content.Context;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
-import android.test.suitebuilder.annotation.SmallTest;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
@@ -40,6 +46,8 @@ import org.mockito.stubbing.Answer;
  * Unit tests for {@link com.android.internal.util.WakeupMessage}.
  */
 @SmallTest
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = WakeupMessage.class)
 public class WakeupMessageTest {
     private static final String TEST_CMD_NAME = "TEST cmd Name";
     private static final int TEST_CMD = 18;
@@ -47,11 +55,16 @@ public class WakeupMessageTest {
     private static final int TEST_ARG2 = 182;
     private static final Object TEST_OBJ = "hello";
 
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule.Builder()
+            .setProvideMainThread(true)
+            .build();
+
     @Mock Context mContext;
     @Mock AlarmManager mAlarmManager;
     WakeupMessage mMessage;
     // Make a spy so that we can verify calls to it
-    @Spy MessageCapturingHandler mHandler = new MessageCapturingHandler();
+    @Spy MessageCapturingHandler mHandler;
 
     ArgumentCaptor<AlarmManager.OnAlarmListener> mListenerCaptor =
             ArgumentCaptor.forClass(AlarmManager.OnAlarmListener.class);
@@ -85,6 +98,8 @@ public class WakeupMessageTest {
      */
     @Before
     public void setUp() {
+        mHandler = new MessageCapturingHandler();
+
         MockitoAnnotations.initMocks(this);
 
         when(mContext.getSystemService(Context.ALARM_SERVICE)).thenReturn(mAlarmManager);
diff --git a/core/tests/utiltests/src/com/android/internal/util/XmlUtilsTest.java b/core/tests/utiltests/src/com/android/internal/util/XmlUtilsTest.java
index 0484068bf900..24eb213751bc 100644
--- a/core/tests/utiltests/src/com/android/internal/util/XmlUtilsTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/XmlUtilsTest.java
@@ -17,13 +17,17 @@
 package com.android.internal.util;
 
 import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
 
 import android.util.Xml;
 
+import androidx.test.runner.AndroidJUnit4;
+
 import com.android.modules.utils.TypedXmlPullParser;
 import com.android.modules.utils.TypedXmlSerializer;
 
-import junit.framework.TestCase;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
@@ -32,9 +36,11 @@ import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
 import java.util.Map;
 
-public class XmlUtilsTest extends TestCase {
+@RunWith(AndroidJUnit4.class)
+public class XmlUtilsTest {
 
     // https://code.google.com/p/android/issues/detail?id=63717
+    @Test
     public void testMapWithNullKeys() throws Exception {
         ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
         Map<String, Object> map = new HashMap<String, Object>();
@@ -48,6 +54,7 @@ public class XmlUtilsTest extends TestCase {
         assertEquals("fooValue", deserialized.get("foo"));
     }
 
+    @Test
     public void testreadWriteXmlByteArrayValue() throws Exception {
         byte[] testByteArray = {0x1 , 0xa, 0xb, 0x9, 0x34, (byte) 0xaa, (byte) 0xba, (byte) 0x99};
 
diff --git a/core/tests/utiltests/src/com/android/internal/util/test/FakeSettingsProviderTest.java b/core/tests/utiltests/src/com/android/internal/util/test/FakeSettingsProviderTest.java
index f2be109c8602..502d6b6d7270 100644
--- a/core/tests/utiltests/src/com/android/internal/util/test/FakeSettingsProviderTest.java
+++ b/core/tests/utiltests/src/com/android/internal/util/test/FakeSettingsProviderTest.java
@@ -16,33 +16,41 @@
 
 package com.android.internal.util.test;
 
-import android.content.ContentResolver;
-import android.database.ContentObserver;
-import android.net.Uri;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import android.content.ContentProvider;
+import android.platform.test.annotations.IgnoreUnderRavenwood;
+import android.platform.test.ravenwood.RavenwoodRule;
 import android.provider.Settings;
-import android.test.AndroidTestCase;
 import android.test.mock.MockContentResolver;
-import android.test.mock.MockContext;
-import android.test.suitebuilder.annotation.SmallTest;
-import android.test.suitebuilder.annotation.Suppress;
-import android.util.Log;
 
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.TimeUnit;
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 /**
  * Unit tests for FakeSettingsProvider.
  */
-public class FakeSettingsProviderTest extends AndroidTestCase {
+@RunWith(AndroidJUnit4.class)
+@IgnoreUnderRavenwood(blockedBy = ContentProvider.class)
+public class FakeSettingsProviderTest {
+    @Rule
+    public final RavenwoodRule mRavenwood = new RavenwoodRule();
 
     private MockContentResolver mCr;
 
-    @Override
+    @Before
     public void setUp() throws Exception {
         mCr = new MockContentResolver();
         mCr.addProvider(Settings.AUTHORITY, new FakeSettingsProvider());
     }
 
+    @Test
     @SmallTest
     public void testBasicOperation() throws Exception {
         String settingName = Settings.System.SCREEN_BRIGHTNESS;
diff --git a/ravenwood/framework-minus-apex-ravenwood-policies.txt b/ravenwood/framework-minus-apex-ravenwood-policies.txt
index 6a6ae3876f6b..c9069e5db9cb 100644
--- a/ravenwood/framework-minus-apex-ravenwood-policies.txt
+++ b/ravenwood/framework-minus-apex-ravenwood-policies.txt
@@ -74,6 +74,7 @@ class android.util.proto.ProtoUtils stubclass
 class android.util.proto.WireTypeMismatchException stubclass
 
 # Misc
+class android.util.BackupUtils stubclass
 class android.util.Dumpable stubclass
 class android.util.DebugUtils stubclass
 class android.util.MathUtils stubclass
@@ -81,15 +82,11 @@ class android.util.Patterns stubclass
 class android.util.UtilConfig stubclass
 
 # Internals
-class com.android.internal.util.FastMath stubclass
-class com.android.internal.util.FastPrintWriter stubclass
-class com.android.internal.util.GrowingArrayUtils stubclass
-class com.android.internal.util.LineBreakBufferedWriter stubclass
-class com.android.internal.util.Parcelling stubclass
+class com.android.internal.util.FileRotator stubclass
+class com.android.internal.util.HexDump stubclass
+class com.android.internal.util.MessageUtils stubclass
 class com.android.internal.util.Preconditions stubclass
-class com.android.internal.util.StringPool stubclass
-
-class com.android.internal.os.SomeArgs stubclass
+class com.android.internal.util.TokenBucket stubclass
 
 # Parcel
 class android.os.ParcelFormatException stubclass
diff --git a/ravenwood/junit-src/android/platform/test/annotations/IgnoreUnderRavenwood.java b/ravenwood/junit-src/android/platform/test/annotations/IgnoreUnderRavenwood.java
index edb0442e7b29..916dd5943059 100644
--- a/ravenwood/junit-src/android/platform/test/annotations/IgnoreUnderRavenwood.java
+++ b/ravenwood/junit-src/android/platform/test/annotations/IgnoreUnderRavenwood.java
@@ -36,7 +36,7 @@ import java.lang.annotation.Target;
  *
  * @hide
  */
-@Target(ElementType.METHOD)
+@Target({ElementType.METHOD, ElementType.TYPE})
 @Retention(RetentionPolicy.RUNTIME)
 public @interface IgnoreUnderRavenwood {
     /**
diff --git a/ravenwood/junit-src/android/platform/test/ravenwood/RavenwoodRule.java b/ravenwood/junit-src/android/platform/test/ravenwood/RavenwoodRule.java
index 9db5b9895749..d175713eb92f 100644
--- a/ravenwood/junit-src/android/platform/test/ravenwood/RavenwoodRule.java
+++ b/ravenwood/junit-src/android/platform/test/ravenwood/RavenwoodRule.java
@@ -93,7 +93,7 @@ public class RavenwoodRule implements TestRule {
     /**
      * Return if the current process is running under a Ravenwood test environment.
      */
-    public boolean isUnderRavenwood() {
+    public static boolean isUnderRavenwood() {
         return IS_UNDER_RAVENWOOD;
     }
 
@@ -102,6 +102,9 @@ public class RavenwoodRule implements TestRule {
         return new Statement() {
             @Override
             public void evaluate() throws Throwable {
+                if (description.getTestClass().getAnnotation(IgnoreUnderRavenwood.class) != null) {
+                    Assume.assumeFalse(IS_UNDER_RAVENWOOD);
+                }
                 if (description.getAnnotation(IgnoreUnderRavenwood.class) != null) {
                     Assume.assumeFalse(IS_UNDER_RAVENWOOD);
                 }
diff --git a/ravenwood/ravenwood-annotation-allowed-classes.txt b/ravenwood/ravenwood-annotation-allowed-classes.txt
index 468b7c9188ab..831fce12b9c9 100644
--- a/ravenwood/ravenwood-annotation-allowed-classes.txt
+++ b/ravenwood/ravenwood-annotation-allowed-classes.txt
@@ -4,11 +4,21 @@ com.android.internal.util.ArrayUtils
 
 android.util.AtomicFile
 android.util.DataUnit
+android.util.DayOfMonthCursor
+android.util.DumpableContainer
 android.util.EventLog
 android.util.IntArray
+android.util.KeyValueListParser
 android.util.LongArray
+android.util.LongArrayQueue
+android.util.LongSparseLongArray
 android.util.LruCache
+android.util.MonthDisplayHelper
+android.util.RecurrenceRule
+android.util.RotationUtils
 android.util.Slog
+android.util.SparseDoubleArray
+android.util.SparseSetArray
 android.util.TimeUtils
 android.util.Xml
 
@@ -79,3 +89,30 @@ android.graphics.Rect
 android.graphics.RectF
 
 com.android.server.LocalServices
+
+com.android.internal.os.SomeArgs
+
+com.android.internal.util.BitUtils
+com.android.internal.util.BitwiseInputStream
+com.android.internal.util.BitwiseOutputStream
+com.android.internal.util.CallbackRegistry
+com.android.internal.util.DumpableContainer
+com.android.internal.util.dump.DumpableContainerImpl
+com.android.internal.util.DumpUtils
+com.android.internal.util.FastMath
+com.android.internal.util.FastPrintWriter
+com.android.internal.util.FileRotator
+com.android.internal.util.GrowingArrayUtils
+com.android.internal.util.HeavyHitterSketch
+com.android.internal.util.LineBreakBufferedWriter
+com.android.internal.util.ObjectUtils
+com.android.internal.util.Parcelling
+com.android.internal.util.ParseUtils
+com.android.internal.util.ProcFileReader
+com.android.internal.util.QuickSelect
+com.android.internal.util.RingBuffer
+com.android.internal.util.StringPool
+
+com.google.android.collect.Lists
+com.google.android.collect.Maps
+com.google.android.collect.Sets
diff --git a/tools/hoststubgen/hoststubgen/helper-framework-runtime-src/libcore-fake/libcore/util/HexEncoding.java b/tools/hoststubgen/hoststubgen/helper-framework-runtime-src/libcore-fake/libcore/util/HexEncoding.java
new file mode 100644
index 000000000000..cc2fb7bbf236
--- /dev/null
+++ b/tools/hoststubgen/hoststubgen/helper-framework-runtime-src/libcore-fake/libcore/util/HexEncoding.java
@@ -0,0 +1,240 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package libcore.util;
+
+/**
+ * Hexadecimal encoding where each byte is represented by two hexadecimal digits.
+ * @hide
+ */
+public class HexEncoding {
+
+    private static final char[] LOWER_CASE_DIGITS = {
+            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
+    };
+
+    private static final char[] UPPER_CASE_DIGITS = {
+            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
+    };
+
+    /** Hidden constructor to prevent instantiation. */
+    private HexEncoding() {}
+
+    /**
+     * Encodes the provided byte as a two-digit hexadecimal String value.
+     *
+     * @param  b byte to encode
+     * @param  upperCase {@code true} to use uppercase letters, {@code false}
+     *         for lowercase
+     * @return the encoded string
+     *
+     * @hide
+     */
+    public static String encodeToString(byte b, boolean upperCase) {
+        char[] digits = upperCase ? UPPER_CASE_DIGITS : LOWER_CASE_DIGITS;
+        char[] buf = new char[2]; // We always want two digits.
+        buf[0] = digits[(b >> 4) & 0xf];
+        buf[1] = digits[b & 0xf];
+        return new String(buf, 0, 2);
+    }
+
+    /**
+     * Encodes the provided data as a sequence of hexadecimal characters.
+     *
+     * @param  data byte array to encode
+     * @return the encoded data, using uppercase letters
+     *
+     * @hide
+     */
+    public static char[] encode(byte[] data) {
+        return encode(data, 0, data.length, true /* upperCase */);
+    }
+
+    /**
+     * Encodes the provided data as a sequence of hexadecimal characters.
+     *
+     * @param  data byte array to encode
+     * @param  upperCase {@code true} to use uppercase letters, {@code false}
+     *         for lowercase
+     * @return the encoded data
+     *
+     * @hide
+     */
+    public static char[] encode(byte[] data, boolean upperCase) {
+        return encode(data, 0, data.length, upperCase);
+    }
+
+    /**
+     * Encodes the provided data as a sequence of hexadecimal characters.
+     *
+     * @param  data byte array containing the data to encode
+     * @param  offset offset of the data to encode in the {@code data} array
+     * @param  len length of the data to encode in the {@code data} array
+     * @return the encoded data, using uppercase letters
+     *
+     * @hide
+     */
+    public static char[] encode(byte[] data, int offset, int len) {
+        return encode(data, offset, len, true /* upperCase */);
+    }
+
+    /**
+     * Encodes the provided data as a sequence of hexadecimal characters.
+     */
+    private static char[] encode(byte[] data, int offset, int len, boolean upperCase) {
+        char[] digits = upperCase ? UPPER_CASE_DIGITS : LOWER_CASE_DIGITS;
+        char[] result = new char[len * 2];
+        for (int i = 0; i < len; i++) {
+            byte b = data[offset + i];
+            int resultIndex = 2 * i;
+            result[resultIndex] = (digits[(b >> 4) & 0x0f]);
+            result[resultIndex + 1] = (digits[b & 0x0f]);
+        }
+
+        return result;
+    }
+
+    /**
+     * Encodes the provided data as a sequence of hexadecimal characters.
+     *
+     * @param  data byte array to encode
+     * @return the encoded data, using uppercase letters
+     *
+     * @hide
+     */
+    public static String encodeToString(byte[] data) {
+        return encodeToString(data, true /* upperCase */);
+    }
+
+    /**
+     * Encodes the provided data as a sequence of hexadecimal characters.
+     *
+     * @param  data byte array to encode.
+     * @param  upperCase {@code true} to use uppercase letters, {@code false}
+     *         for lowercase
+     * @return the encoded data
+     *
+     * @hide
+     */
+    public static String encodeToString(byte[] data, boolean upperCase) {
+        return new String(encode(data, upperCase));
+    }
+
+    /**
+     * Decodes the provided hexadecimal sequence. Odd-length inputs are not
+     * allowed.
+     *
+     * @param  encoded string of hexadecimal characters to decode. Letters
+     *         can be either uppercase or lowercase.
+     * @return the decoded data
+     * @throws IllegalArgumentException if the input is malformed
+     *
+     * @hide
+     */
+    public static byte[] decode(String encoded) throws IllegalArgumentException {
+        return decode(encoded.toCharArray());
+    }
+
+    /**
+     * Decodes the provided hexadecimal sequence.
+     *
+     * @param  encoded string of hexadecimal characters to decode. Letters
+     *         can be either uppercase or lowercase.
+     * @param  allowSingleChar If {@code true} odd-length inputs are allowed and
+     *         the first character is interpreted as the lower bits of the first
+     *         result byte. If {@code false} odd-length inputs are not allowed.
+     * @return the decoded data
+     * @throws IllegalArgumentException if the input is malformed
+     *
+     * @hide
+     */
+    public static byte[] decode(String encoded, boolean allowSingleChar)
+            throws IllegalArgumentException {
+        return decode(encoded.toCharArray(), allowSingleChar);
+    }
+
+    /**
+     * Decodes the provided hexadecimal sequence. Odd-length inputs are not
+     * allowed.
+     *
+     * @param  encoded char array of hexadecimal characters to decode. Letters
+     *         can be either uppercase or lowercase.
+     * @return the decoded data
+     * @throws IllegalArgumentException if the input is malformed
+     *
+     * @hide
+     */
+    public static byte[] decode(char[] encoded) throws IllegalArgumentException {
+        return decode(encoded, false);
+    }
+
+    /**
+     * Decodes the provided hexadecimal sequence.
+     *
+     * @param  encoded char array of hexadecimal characters to decode. Letters
+     *         can be either uppercase or lowercase.
+     * @param  allowSingleChar If {@code true} odd-length inputs are allowed and
+     *         the first character is interpreted as the lower bits of the first
+     *         result byte. If {@code false} odd-length inputs are not allowed.
+     * @return the decoded data
+     * @throws IllegalArgumentException if the input is malformed
+     *
+     * @hide
+     */
+    public static byte[] decode(char[] encoded, boolean allowSingleChar)
+            throws IllegalArgumentException {
+        int encodedLength = encoded.length;
+        int resultLengthBytes = (encodedLength + 1) / 2;
+        byte[] result = new byte[resultLengthBytes];
+
+        int resultOffset = 0;
+        int i = 0;
+        if (allowSingleChar) {
+            if ((encodedLength % 2) != 0) {
+                // Odd number of digits -- the first digit is the lower 4 bits of the first result
+                // byte.
+                result[resultOffset++] = (byte) toDigit(encoded, i);
+                i++;
+            }
+        } else {
+            if ((encodedLength % 2) != 0) {
+                throw new IllegalArgumentException("Invalid input length: " + encodedLength);
+            }
+        }
+
+        for (; i < encodedLength; i += 2) {
+            result[resultOffset++] = (byte) ((toDigit(encoded, i) << 4) | toDigit(encoded, i + 1));
+        }
+
+        return result;
+    }
+
+    private static int toDigit(char[] str, int offset) throws IllegalArgumentException {
+        // NOTE: that this isn't really a code point in the traditional sense, since we're
+        // just rejecting surrogate pairs outright.
+        int pseudoCodePoint = str[offset];
+
+        if ('0' <= pseudoCodePoint && pseudoCodePoint <= '9') {
+            return pseudoCodePoint - '0';
+        } else if ('a' <= pseudoCodePoint && pseudoCodePoint <= 'f') {
+            return 10 + (pseudoCodePoint - 'a');
+        } else if ('A' <= pseudoCodePoint && pseudoCodePoint <= 'F') {
+            return 10 + (pseudoCodePoint - 'A');
+        }
+
+        throw new IllegalArgumentException("Illegal char: " + str[offset] + " at offset " + offset);
+    }
+}