Refactor DreamLogger with Logger

This change refactors where DreamLogger is used to take advantage of the
Logger class.

It also adds a FakeLogBuffer class which returns a real LogMessage
object to prevent a NullPointerException when operating on the message.

Bug: 276475093
Test: atest ComplicationCollectionLiveDataTest
Test: atest DreamOverlayAnimationsControllerTest
Test: atest DreamOverlayStateControllerTest
Test: atest DreamOverlayStatusBarViewControllerTest
Change-Id: I68160c4f2c1d46abb0cf67531e749d02f297047d

9 files changed, 148 insertions, 48 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/dreams/DreamLogger.kt b/packages/SystemUI/src/com/android/systemui/dreams/DreamLogger.kt
index 0e224060a36f..f3a07fc53027 100644
--- a/packages/SystemUI/src/com/android/systemui/dreams/DreamLogger.kt
+++ b/packages/SystemUI/src/com/android/systemui/dreams/DreamLogger.kt
@@ -16,15 +16,52 @@
 
 package com.android.systemui.dreams
 
-import com.android.systemui.log.LogBuffer
-import com.android.systemui.log.core.LogLevel
-import com.android.systemui.log.dagger.DreamLog
-import javax.inject.Inject
+import com.android.systemui.log.core.Logger
+import com.android.systemui.log.core.MessageBuffer
 
 /** Logs dream-related stuff to a {@link LogBuffer}. */
-class DreamLogger @Inject constructor(@DreamLog private val buffer: LogBuffer) {
-    /** Logs a debug message to the buffer. */
-    fun d(tag: String, message: String) {
-        buffer.log(tag, LogLevel.DEBUG, { str1 = message }, { message })
-    }
+class DreamLogger(buffer: MessageBuffer, tag: String) : Logger(buffer, tag) {
+    fun logDreamOverlayEnabled(enabled: Boolean) =
+        d({ "Dream overlay enabled: $bool1" }) { bool1 = enabled }
+
+    fun logIgnoreAddComplication(reason: String, complication: String) =
+        d({ "Ignore adding complication, reason: $str1, complication: $str2" }) {
+            str1 = reason
+            str2 = complication
+        }
+
+    fun logIgnoreRemoveComplication(reason: String, complication: String) =
+        d({ "Ignore removing complication, reason: $str1, complication: $str2" }) {
+            str1 = reason
+            str2 = complication
+        }
+
+    fun logAddComplication(complication: String) =
+        d({ "Add dream complication: $str1" }) { str1 = complication }
+
+    fun logRemoveComplication(complication: String) =
+        d({ "Remove dream complication: $str1" }) { str1 = complication }
+
+    fun logOverlayActive(active: Boolean) = d({ "Dream overlay active: $bool1" }) { bool1 = active }
+
+    fun logLowLightActive(active: Boolean) =
+        d({ "Low light mode active: $bool1" }) { bool1 = active }
+
+    fun logHasAssistantAttention(hasAttention: Boolean) =
+        d({ "Dream overlay has Assistant attention: $bool1" }) { bool1 = hasAttention }
+
+    fun logStatusBarVisible(visible: Boolean) =
+        d({ "Dream overlay status bar visible: $bool1" }) { bool1 = visible }
+
+    fun logAvailableComplicationTypes(types: Int) =
+        d({ "Available complication types: $int1" }) { int1 = types }
+
+    fun logShouldShowComplications(showComplications: Boolean) =
+        d({ "Dream overlay should show complications: $bool1" }) { bool1 = showComplications }
+
+    fun logShowOrHideStatusBarItem(show: Boolean, type: String) =
+        d({ "${if (bool1) "Showing" else "Hiding"} dream status bar item: $int1" }) {
+            bool1 = show
+            str1 = type
+        }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayAnimationsController.kt b/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayAnimationsController.kt
index 484bf3d51f36..01fb5227749f 100644
--- a/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayAnimationsController.kt
+++ b/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayAnimationsController.kt
@@ -36,6 +36,9 @@ import com.android.systemui.complication.ComplicationLayoutParams.Position
 import com.android.systemui.dreams.dagger.DreamOverlayModule
 import com.android.systemui.keyguard.ui.viewmodel.DreamingToLockscreenTransitionViewModel
 import com.android.systemui.lifecycle.repeatWhenAttached
+import com.android.systemui.log.LogBuffer
+import com.android.systemui.log.core.Logger
+import com.android.systemui.log.dagger.DreamLog
 import com.android.systemui.statusbar.BlurUtils
 import com.android.systemui.statusbar.CrossFadeHelper
 import com.android.systemui.statusbar.policy.ConfigurationController
@@ -65,12 +68,14 @@ constructor(
     private val mDreamInTranslationYDistance: Int,
     @Named(DreamOverlayModule.DREAM_IN_TRANSLATION_Y_DURATION)
     private val mDreamInTranslationYDurationMs: Long,
-    private val mLogger: DreamLogger,
+    @DreamLog logBuffer: LogBuffer,
 ) {
     companion object {
         private const val TAG = "DreamOverlayAnimationsController"
     }
 
+    private val logger = Logger(logBuffer, TAG)
+
     private var mAnimator: Animator? = null
     private lateinit var view: View
 
@@ -179,11 +184,11 @@ constructor(
                 doOnEnd {
                     mAnimator = null
                     mOverlayStateController.setEntryAnimationsFinished(true)
-                    mLogger.d(TAG, "Dream overlay entry animations finished.")
+                    logger.d("Dream overlay entry animations finished.")
                 }
-                doOnCancel { mLogger.d(TAG, "Dream overlay entry animations canceled.") }
+                doOnCancel { logger.d("Dream overlay entry animations canceled.") }
                 start()
-                mLogger.d(TAG, "Dream overlay entry animations started.")
+                logger.d("Dream overlay entry animations started.")
             }
     }
 
@@ -242,11 +247,11 @@ constructor(
                 doOnEnd {
                     mAnimator = null
                     mOverlayStateController.setExitAnimationsRunning(false)
-                    mLogger.d(TAG, "Dream overlay exit animations finished.")
+                    logger.d("Dream overlay exit animations finished.")
                 }
-                doOnCancel { mLogger.d(TAG, "Dream overlay exit animations canceled.") }
+                doOnCancel { logger.d("Dream overlay exit animations canceled.") }
                 start()
-                mLogger.d(TAG, "Dream overlay exit animations started.")
+                logger.d("Dream overlay exit animations started.")
             }
         mOverlayStateController.setExitAnimationsRunning(true)
         return mAnimator as AnimatorSet
diff --git a/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayStateController.java b/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayStateController.java
index c2421dcbc6ca..c9748f954670 100644
--- a/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayStateController.java
+++ b/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayStateController.java
@@ -28,6 +28,8 @@ import com.android.systemui.dagger.SysUISingleton;
 import com.android.systemui.dagger.qualifiers.Main;
 import com.android.systemui.flags.FeatureFlags;
 import com.android.systemui.flags.Flags;
+import com.android.systemui.log.LogBuffer;
+import com.android.systemui.log.dagger.DreamLog;
 import com.android.systemui.statusbar.policy.CallbackController;
 
 import java.util.ArrayList;
@@ -115,10 +117,10 @@ public class DreamOverlayStateController implements
     public DreamOverlayStateController(@Main Executor executor,
             @Named(DREAM_OVERLAY_ENABLED) boolean overlayEnabled,
             FeatureFlags featureFlags,
-            DreamLogger dreamLogger) {
+            @DreamLog LogBuffer logBuffer) {
         mExecutor = executor;
         mOverlayEnabled = overlayEnabled;
-        mLogger = dreamLogger;
+        mLogger = new DreamLogger(logBuffer, TAG);
         mFeatureFlags = featureFlags;
         if (mFeatureFlags.isEnabled(Flags.ALWAYS_SHOW_HOME_CONTROLS_ON_DREAMS)) {
             mSupportedTypes = Complication.COMPLICATION_TYPE_NONE
@@ -126,7 +128,7 @@ public class DreamOverlayStateController implements
         } else {
             mSupportedTypes = Complication.COMPLICATION_TYPE_NONE;
         }
-        mLogger.d(TAG, "Dream overlay enabled: " + mOverlayEnabled);
+        mLogger.logDreamOverlayEnabled(mOverlayEnabled);
     }
 
     /**
@@ -134,14 +136,13 @@ public class DreamOverlayStateController implements
      */
     public void addComplication(Complication complication) {
         if (!mOverlayEnabled) {
-            mLogger.d(TAG,
-                    "Ignoring adding complication due to overlay disabled: " + complication);
+            mLogger.logIgnoreAddComplication("overlay disabled", complication.toString());
             return;
         }
 
         mExecutor.execute(() -> {
             if (mComplications.add(complication)) {
-                mLogger.d(TAG, "Added dream complication: " + complication);
+                mLogger.logAddComplication(complication.toString());
                 mCallbacks.stream().forEach(callback -> callback.onComplicationsChanged());
             }
         });
@@ -152,14 +153,13 @@ public class DreamOverlayStateController implements
      */
     public void removeComplication(Complication complication) {
         if (!mOverlayEnabled) {
-            mLogger.d(TAG,
-                    "Ignoring removing complication due to overlay disabled: " + complication);
+            mLogger.logIgnoreRemoveComplication("overlay disabled", complication.toString());
             return;
         }
 
         mExecutor.execute(() -> {
             if (mComplications.remove(complication)) {
-                mLogger.d(TAG, "Removed dream complication: " + complication);
+                mLogger.logRemoveComplication(complication.toString());
                 mCallbacks.stream().forEach(callback -> callback.onComplicationsChanged());
             }
         });
@@ -305,7 +305,7 @@ public class DreamOverlayStateController implements
      * @param active {@code true} if overlay is active, {@code false} otherwise.
      */
     public void setOverlayActive(boolean active) {
-        mLogger.d(TAG, "Dream overlay active: " + active);
+        mLogger.logOverlayActive(active);
         modifyState(active ? OP_SET_STATE : OP_CLEAR_STATE, STATE_DREAM_OVERLAY_ACTIVE);
     }
 
@@ -314,7 +314,7 @@ public class DreamOverlayStateController implements
      * @param active {@code true} if low light mode is active, {@code false} otherwise.
      */
     public void setLowLightActive(boolean active) {
-        mLogger.d(TAG, "Low light mode active: " + active);
+        mLogger.logLowLightActive(active);
 
         if (isLowLightActive() && !active) {
             // Notify that we're exiting low light only on the transition from active to not active.
@@ -346,7 +346,7 @@ public class DreamOverlayStateController implements
      * @param hasAttention {@code true} if has the user's attention, {@code false} otherwise.
      */
     public void setHasAssistantAttention(boolean hasAttention) {
-        mLogger.d(TAG, "Dream overlay has Assistant attention: " + hasAttention);
+        mLogger.logHasAssistantAttention(hasAttention);
         modifyState(hasAttention ? OP_SET_STATE : OP_CLEAR_STATE, STATE_HAS_ASSISTANT_ATTENTION);
     }
 
@@ -355,7 +355,7 @@ public class DreamOverlayStateController implements
      * @param visible {@code true} if the status bar is visible, {@code false} otherwise.
      */
     public void setDreamOverlayStatusBarVisible(boolean visible) {
-        mLogger.d(TAG, "Dream overlay status bar visible: " + visible);
+        mLogger.logStatusBarVisible(visible);
         modifyState(
                 visible ? OP_SET_STATE : OP_CLEAR_STATE, STATE_DREAM_OVERLAY_STATUS_BAR_VISIBLE);
     }
@@ -373,7 +373,7 @@ public class DreamOverlayStateController implements
      */
     public void setAvailableComplicationTypes(@Complication.ComplicationType int types) {
         mExecutor.execute(() -> {
-            mLogger.d(TAG, "Available complication types: " + types);
+            mLogger.logAvailableComplicationTypes(types);
             mAvailableComplicationTypes = types;
             mCallbacks.forEach(Callback::onAvailableComplicationTypesChanged);
         });
@@ -391,7 +391,7 @@ public class DreamOverlayStateController implements
      */
     public void setShouldShowComplications(boolean shouldShowComplications) {
         mExecutor.execute(() -> {
-            mLogger.d(TAG, "Should show complications: " + shouldShowComplications);
+            mLogger.logShouldShowComplications(shouldShowComplications);
             mShouldShowComplications = shouldShowComplications;
             mCallbacks.forEach(Callback::onAvailableComplicationTypesChanged);
         });
diff --git a/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayStatusBarViewController.java b/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayStatusBarViewController.java
index 3a284083e844..a6401b6594ba 100644
--- a/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayStatusBarViewController.java
+++ b/packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayStatusBarViewController.java
@@ -36,6 +36,8 @@ import com.android.systemui.R;
 import com.android.systemui.dagger.qualifiers.Main;
 import com.android.systemui.dreams.DreamOverlayStatusBarItemsProvider.StatusBarItem;
 import com.android.systemui.dreams.dagger.DreamOverlayComponent;
+import com.android.systemui.log.LogBuffer;
+import com.android.systemui.log.dagger.DreamLog;
 import com.android.systemui.settings.UserTracker;
 import com.android.systemui.statusbar.CrossFadeHelper;
 import com.android.systemui.statusbar.policy.IndividualSensorPrivacyController;
@@ -161,7 +163,7 @@ public class DreamOverlayStatusBarViewController extends ViewController<DreamOve
             DreamOverlayStatusBarItemsProvider statusBarItemsProvider,
             DreamOverlayStateController dreamOverlayStateController,
             UserTracker userTracker,
-            DreamLogger dreamLogger) {
+            @DreamLog LogBuffer logBuffer) {
         super(view);
         mResources = resources;
         mMainExecutor = mainExecutor;
@@ -177,7 +179,7 @@ public class DreamOverlayStatusBarViewController extends ViewController<DreamOve
         mZenModeController = zenModeController;
         mDreamOverlayStateController = dreamOverlayStateController;
         mUserTracker = userTracker;
-        mLogger = dreamLogger;
+        mLogger = new DreamLogger(logBuffer, TAG);
 
         // Register to receive show/hide updates for the system status bar. Our custom status bar
         // needs to hide when the system status bar is showing to ovoid overlapping status bars.
@@ -346,8 +348,8 @@ public class DreamOverlayStatusBarViewController extends ViewController<DreamOve
             @Nullable String contentDescription) {
         mMainExecutor.execute(() -> {
             if (mIsAttached) {
-                mLogger.d(TAG, (show ? "Showing" : "Hiding") + " dream status bar item: "
-                        + DreamOverlayStatusBarView.getLoggableStatusIconType(iconType));
+                mLogger.logShowOrHideStatusBarItem(
+                        show, DreamOverlayStatusBarView.getLoggableStatusIconType(iconType));
                 mView.showIcon(iconType, show, contentDescription);
             }
         });
diff --git a/packages/SystemUI/tests/src/com/android/systemui/complication/ComplicationCollectionLiveDataTest.java b/packages/SystemUI/tests/src/com/android/systemui/complication/ComplicationCollectionLiveDataTest.java
index 461ec653d819..40f0ed3626db 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/complication/ComplicationCollectionLiveDataTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/complication/ComplicationCollectionLiveDataTest.java
@@ -28,10 +28,10 @@ import androidx.lifecycle.Observer;
 import androidx.test.filters.SmallTest;
 
 import com.android.systemui.SysuiTestCase;
-import com.android.systemui.dreams.DreamLogger;
 import com.android.systemui.dreams.DreamOverlayStateController;
 import com.android.systemui.flags.FakeFeatureFlags;
 import com.android.systemui.flags.Flags;
+import com.android.systemui.log.core.FakeLogBuffer;
 import com.android.systemui.util.concurrency.FakeExecutor;
 import com.android.systemui.util.time.FakeSystemClock;
 
@@ -57,8 +57,6 @@ public class ComplicationCollectionLiveDataTest extends SysuiTestCase {
     private FakeFeatureFlags mFeatureFlags;
     @Mock
     private Observer mObserver;
-    @Mock
-    private DreamLogger mLogger;
 
     @Before
     public void setUp() {
@@ -70,7 +68,7 @@ public class ComplicationCollectionLiveDataTest extends SysuiTestCase {
                 mExecutor,
                 /* overlayEnabled= */ true,
                 mFeatureFlags,
-                mLogger);
+                FakeLogBuffer.Factory.Companion.create());
         mLiveData = new ComplicationCollectionLiveData(mStateController);
     }
 
diff --git a/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayAnimationsControllerTest.kt b/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayAnimationsControllerTest.kt
index a00e5456b711..57307fc84b1c 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayAnimationsControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayAnimationsControllerTest.kt
@@ -9,6 +9,7 @@ import androidx.test.filters.SmallTest
 import com.android.systemui.SysuiTestCase
 import com.android.systemui.complication.ComplicationHostViewController
 import com.android.systemui.keyguard.ui.viewmodel.DreamingToLockscreenTransitionViewModel
+import com.android.systemui.log.core.FakeLogBuffer
 import com.android.systemui.statusbar.BlurUtils
 import com.android.systemui.statusbar.policy.ConfigurationController
 import com.android.systemui.util.mockito.argumentCaptor
@@ -47,7 +48,7 @@ class DreamOverlayAnimationsControllerTest : SysuiTestCase() {
     @Mock private lateinit var stateController: DreamOverlayStateController
     @Mock private lateinit var configController: ConfigurationController
     @Mock private lateinit var transitionViewModel: DreamingToLockscreenTransitionViewModel
-    @Mock private lateinit var logger: DreamLogger
+    private val logBuffer = FakeLogBuffer.Factory.create()
     private lateinit var controller: DreamOverlayAnimationsController
 
     @Before
@@ -66,7 +67,7 @@ class DreamOverlayAnimationsControllerTest : SysuiTestCase() {
                 DREAM_IN_COMPLICATIONS_ANIMATION_DURATION,
                 DREAM_IN_TRANSLATION_Y_DISTANCE,
                 DREAM_IN_TRANSLATION_Y_DURATION,
-                logger
+                logBuffer
             )
 
         val mockView: View = mock()
diff --git a/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayStateControllerTest.java b/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayStateControllerTest.java
index 2c1ebe4121af..44a78ac3bc96 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayStateControllerTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayStateControllerTest.java
@@ -34,6 +34,8 @@ import com.android.systemui.SysuiTestCase;
 import com.android.systemui.complication.Complication;
 import com.android.systemui.flags.FeatureFlags;
 import com.android.systemui.flags.Flags;
+import com.android.systemui.log.LogBuffer;
+import com.android.systemui.log.core.FakeLogBuffer;
 import com.android.systemui.util.concurrency.FakeExecutor;
 import com.android.systemui.util.time.FakeSystemClock;
 
@@ -58,8 +60,7 @@ public class DreamOverlayStateControllerTest extends SysuiTestCase {
     @Mock
     private FeatureFlags mFeatureFlags;
 
-    @Mock
-    private DreamLogger mLogger;
+    private final LogBuffer mLogBuffer = FakeLogBuffer.Factory.Companion.create();
 
     final FakeExecutor mExecutor = new FakeExecutor(new FakeSystemClock());
 
@@ -408,6 +409,11 @@ public class DreamOverlayStateControllerTest extends SysuiTestCase {
     }
 
     private DreamOverlayStateController getDreamOverlayStateController(boolean overlayEnabled) {
-        return new DreamOverlayStateController(mExecutor, overlayEnabled, mFeatureFlags, mLogger);
+        return new DreamOverlayStateController(
+                mExecutor,
+                overlayEnabled,
+                mFeatureFlags,
+                mLogBuffer
+        );
     }
 }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayStatusBarViewControllerTest.java b/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayStatusBarViewControllerTest.java
index 5dc0e55632fd..4e74f451932b 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayStatusBarViewControllerTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayStatusBarViewControllerTest.java
@@ -48,6 +48,8 @@ import androidx.test.filters.SmallTest;
 
 import com.android.systemui.R;
 import com.android.systemui.SysuiTestCase;
+import com.android.systemui.log.LogBuffer;
+import com.android.systemui.log.core.FakeLogBuffer;
 import com.android.systemui.settings.UserTracker;
 import com.android.systemui.statusbar.policy.IndividualSensorPrivacyController;
 import com.android.systemui.statusbar.policy.NextAlarmController;
@@ -113,8 +115,8 @@ public class DreamOverlayStatusBarViewControllerTest extends SysuiTestCase {
     DreamOverlayStateController mDreamOverlayStateController;
     @Mock
     UserTracker mUserTracker;
-    @Mock
-    DreamLogger mLogger;
+
+    LogBuffer mLogBuffer = FakeLogBuffer.Factory.Companion.create();
 
     @Captor
     private ArgumentCaptor<DreamOverlayStateController.Callback> mCallbackCaptor;
@@ -149,7 +151,7 @@ public class DreamOverlayStatusBarViewControllerTest extends SysuiTestCase {
                 mDreamOverlayStatusBarItemsProvider,
                 mDreamOverlayStateController,
                 mUserTracker,
-                mLogger);
+                mLogBuffer);
     }
 
     @Test
@@ -293,7 +295,7 @@ public class DreamOverlayStatusBarViewControllerTest extends SysuiTestCase {
                 mDreamOverlayStatusBarItemsProvider,
                 mDreamOverlayStateController,
                 mUserTracker,
-                mLogger);
+                mLogBuffer);
         controller.onViewAttached();
         verify(mView, never()).showIcon(
                 eq(DreamOverlayStatusBarView.STATUS_ICON_NOTIFICATIONS), eq(true), any());
diff --git a/packages/SystemUI/tests/src/com/android/systemui/log/core/FakeLogBuffer.kt b/packages/SystemUI/tests/src/com/android/systemui/log/core/FakeLogBuffer.kt
new file mode 100644
index 000000000000..272d686e974b
--- /dev/null
+++ b/packages/SystemUI/tests/src/com/android/systemui/log/core/FakeLogBuffer.kt
@@ -0,0 +1,49 @@
+/*
+ * 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.systemui.log.core
+
+import com.android.systemui.log.LogBuffer
+import com.android.systemui.log.LogMessageImpl
+import com.android.systemui.util.mockito.any
+import com.android.systemui.util.mockito.mock
+import com.android.systemui.util.mockito.nullable
+import com.android.systemui.util.mockito.whenever
+import org.mockito.Mockito.anyString
+
+/**
+ * A fake [LogBuffer] used for testing that obtains a real [LogMessage] to prevent a
+ * [NullPointerException].
+ */
+class FakeLogBuffer private constructor() {
+    class Factory private constructor() {
+        companion object {
+            fun create(): LogBuffer {
+                val logBuffer = mock<LogBuffer>()
+                whenever(
+                        logBuffer.obtain(
+                            tag = anyString(),
+                            level = any(),
+                            messagePrinter = any(),
+                            exception = nullable(),
+                        )
+                    )
+                    .thenReturn(LogMessageImpl.Factory.create())
+                return logBuffer
+            }
+        }
+    }
+}