Introduce a shared class for test utilities.

To be used more in later CLs.

Test: atest libnativeloader_e2e_tests
Bug: 137356719
Bug: 237577392
Change-Id: I35ef7df45e6337d4eed91a82d561df5f48784670
diff --git a/libnativeloader/test/Android.bp b/libnativeloader/test/Android.bp
index dd5e969..b384dcc 100644
--- a/libnativeloader/test/Android.bp
+++ b/libnativeloader/test/Android.bp
@@ -40,6 +40,15 @@
     jni_libs: ["libnativeloader_testlib"],
 }
 
+java_library {
+    name: "loadlibrarytest_test_utils",
+    static_libs: [
+        "androidx.test.ext.junit",
+        "androidx.test.ext.truth",
+    ],
+    srcs: ["src/android/test/lib/TestUtils.java"],
+}
+
 java_defaults {
     name: "loadlibrarytest_app_defaults",
     defaults: ["art_module_source_build_java_defaults"],
@@ -51,8 +60,8 @@
 
     static_libs: [
         "androidx.test.ext.junit",
-        "androidx.test.ext.truth",
         "androidx.test.rules",
+        "loadlibrarytest_test_utils",
     ],
 }
 
diff --git a/libnativeloader/test/src/android/test/app/ProductAppTest.java b/libnativeloader/test/src/android/test/app/ProductAppTest.java
index 243e2c7..5510d55 100644
--- a/libnativeloader/test/src/android/test/app/ProductAppTest.java
+++ b/libnativeloader/test/src/android/test/app/ProductAppTest.java
@@ -16,9 +16,6 @@
 
 package android.test.app;
 
-import static com.google.common.truth.Truth.assertThat;
-import static org.junit.Assert.assertThrows;
-
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 import org.junit.Test;
diff --git a/libnativeloader/test/src/android/test/app/SystemAppTest.java b/libnativeloader/test/src/android/test/app/SystemAppTest.java
index dd680f5..faf891f 100644
--- a/libnativeloader/test/src/android/test/app/SystemAppTest.java
+++ b/libnativeloader/test/src/android/test/app/SystemAppTest.java
@@ -16,9 +16,6 @@
 
 package android.test.app;
 
-import static com.google.common.truth.Truth.assertThat;
-import static org.junit.Assert.assertThrows;
-
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 import org.junit.Test;
diff --git a/libnativeloader/test/src/android/test/app/VendorAppTest.java b/libnativeloader/test/src/android/test/app/VendorAppTest.java
index a830d06..bd6d637 100644
--- a/libnativeloader/test/src/android/test/app/VendorAppTest.java
+++ b/libnativeloader/test/src/android/test/app/VendorAppTest.java
@@ -16,9 +16,7 @@
 
 package android.test.app;
 
-import static com.google.common.truth.Truth.assertThat;
-import static org.junit.Assert.assertThrows;
-
+import android.test.lib.TestUtils;
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 import org.junit.Test;
@@ -29,18 +27,11 @@
 public class VendorAppTest {
     @Test
     public void testLoadLibraries() {
-        assertLinkerNamespaceError("foo.oem1");
-        assertLinkerNamespaceError("bar.oem1");
-        assertLinkerNamespaceError("foo.oem2");
-        assertLinkerNamespaceError("bar.oem2");
+        TestUtils.assertLinkerNamespaceError("foo.oem1");
+        TestUtils.assertLinkerNamespaceError("bar.oem1");
+        TestUtils.assertLinkerNamespaceError("foo.oem2");
+        TestUtils.assertLinkerNamespaceError("bar.oem2");
         System.loadLibrary("foo.product1");
         System.loadLibrary("bar.product1");
     }
-
-    private void assertLinkerNamespaceError(String libraryName) {
-        Throwable t =
-                assertThrows(UnsatisfiedLinkError.class, () -> System.loadLibrary(libraryName));
-        assertThat(t.getMessage())
-                .containsMatch("dlopen failed: .* is not accessible for the namespace");
-    }
 }
diff --git a/libnativeloader/test/src/android/test/lib/TestUtils.java b/libnativeloader/test/src/android/test/lib/TestUtils.java
new file mode 100644
index 0000000..1518cd0
--- /dev/null
+++ b/libnativeloader/test/src/android/test/lib/TestUtils.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2022 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 android.test.lib;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.Assert.assertThrows;
+
+public final class TestUtils {
+    public static void assertLinkerNamespaceError(String libraryName) {
+        Throwable t =
+                assertThrows(UnsatisfiedLinkError.class, () -> System.loadLibrary(libraryName));
+        assertThat(t.getMessage())
+                .containsMatch("dlopen failed: .* is not accessible for the namespace");
+    }
+}