am: Add unit tests for ActivityMetricsLaunchObserver

Add mockito-based behavioral unit tests for the LaunchObserver.
Verify each state transition.

Test: atest WmTests:ActivityMetricsLaunchObserverTests
Bug: 72170747
Bug: 112680320
Change-Id: Ie8685a1262ccc7730aa5c574274f7ad0caeeedef

services/tests/wmtests/src/com/android/server/wm/ActivityMetricsLaunchObserverTests.java

@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2018 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.server.wm;
+
+import static android.app.ActivityManager.START_SUCCESS;
+import static android.app.ActivityManager.START_TASK_TO_FRONT;
+import static android.app.WindowConfiguration.ACTIVITY_TYPE_STANDARD;
+import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
+
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
+import android.content.Intent;
+import android.os.SystemClock;
+import android.platform.test.annotations.Presubmit;
+import android.util.SparseIntArray;
+
+import androidx.test.filters.FlakyTest;
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Tests for the {@link ActivityMetricsLaunchObserver} class.
+ *
+ * Build/Install/Run:
+ *  atest WmTests:ActivityMetricsLaunchObserverTests
+ */
+@SmallTest
+@Presubmit
+@FlakyTest(detail="promote once confirmed non-flaky")
+public class ActivityMetricsLaunchObserverTests extends ActivityTestsBase {
+    private ActivityMetricsLogger mActivityMetricsLogger;
+    private ActivityMetricsLaunchObserver mLaunchObserver;
+
+    private TestActivityStack mStack;
+    private TaskRecord mTask;
+    private ActivityRecord mActivityRecord;
+    private ActivityRecord mActivityRecordTrampoline;
+
+    @Before
+    public void setUpAMLO() throws Exception {
+        setupActivityTaskManagerService();
+
+        mActivityMetricsLogger =
+                new ActivityMetricsLogger(mSupervisor, mService.mContext, mService.mH.getLooper());
+
+        mLaunchObserver = mock(ActivityMetricsLaunchObserver.class);
+
+        // TODO: Use ActivityMetricsLaunchObserverRegistry .
+        java.lang.reflect.Field f =
+                mActivityMetricsLogger.getClass().getDeclaredField("mLaunchObserver");
+        f.setAccessible(true);
+        f.set(mActivityMetricsLogger, mLaunchObserver);
+
+        // Sometimes we need an ActivityRecord for ActivityMetricsLogger to do anything useful.
+        // This seems to be the easiest way to create an ActivityRecord.
+        mStack = mSupervisor.getDefaultDisplay().createStack(
+                WINDOWING_MODE_FULLSCREEN, ACTIVITY_TYPE_STANDARD, true /* onTop */);
+        mTask = new TaskBuilder(mSupervisor).setStack(mStack).build();
+        mActivityRecord = new ActivityBuilder(mService).setTask(mTask).build();
+        mActivityRecordTrampoline = new ActivityBuilder(mService).setTask(mTask).build();
+    }
+
+    @Test
+    public void testOnIntentStarted() throws Exception {
+        Intent intent = new Intent("action 1");
+
+        mActivityMetricsLogger.notifyActivityLaunching(intent);
+
+        verify(mLaunchObserver).onIntentStarted(eq(intent));
+        verifyNoMoreInteractions(mLaunchObserver);
+    }
+
+    @Test
+    public void testOnIntentFailed() throws Exception {
+        testOnIntentStarted();
+
+        ActivityRecord activityRecord = null;
+
+        // Bringing an intent that's already running 'to front' is not considered
+        // as an ACTIVITY_LAUNCHED state transition.
+        mActivityMetricsLogger.notifyActivityLaunched(START_TASK_TO_FRONT,
+                activityRecord);
+
+        verify(mLaunchObserver).onIntentFailed();
+        verifyNoMoreInteractions(mLaunchObserver);
+    }
+
+    @Test
+    public void testOnActivityLaunched() throws Exception {
+        testOnIntentStarted();
+
+        mActivityMetricsLogger.notifyActivityLaunched(START_SUCCESS,
+                mActivityRecord);
+
+        verify(mLaunchObserver).onActivityLaunched(eq(mActivityRecord), anyInt());
+        verifyNoMoreInteractions(mLaunchObserver);
+    }
+
+    @Test
+    public void testOnActivityLaunchFinished() throws Exception {
+       testOnActivityLaunched();
+
+       mActivityMetricsLogger.notifyTransitionStarting(new SparseIntArray(),
+               SystemClock.uptimeMillis());
+
+       mActivityMetricsLogger.notifyWindowsDrawn(mActivityRecord.getWindowingMode(),
+               SystemClock.uptimeMillis());
+
+       verify(mLaunchObserver).onActivityLaunchFinished(eq(mActivityRecord));
+       verifyNoMoreInteractions(mLaunchObserver);
+    }
+
+    @Test
+    public void testOnActivityLaunchCancelled() throws Exception {
+       testOnActivityLaunched();
+
+       mActivityRecord.nowVisible = true;
+
+       // Cannot time already-visible activities.
+       mActivityMetricsLogger.notifyActivityLaunched(START_TASK_TO_FRONT, mActivityRecord);
+
+       verify(mLaunchObserver).onActivityLaunchCancelled(eq(mActivityRecord));
+       verifyNoMoreInteractions(mLaunchObserver);
+    }
+
+    @Test
+    public void testOnActivityLaunchedTrampoline() throws Exception {
+        testOnIntentStarted();
+
+        mActivityMetricsLogger.notifyActivityLaunched(START_SUCCESS,
+                mActivityRecord);
+
+        verify(mLaunchObserver).onActivityLaunched(eq(mActivityRecord), anyInt());
+
+        // A second, distinct, activity launch is coalesced into the the current app launch sequence
+        mActivityMetricsLogger.notifyActivityLaunched(START_SUCCESS,
+                mActivityRecordTrampoline);
+
+        verifyNoMoreInteractions(mLaunchObserver);
+    }
+
+    @Test
+    public void testOnActivityLaunchFinishedTrampoline() throws Exception {
+       testOnActivityLaunchedTrampoline();
+
+       mActivityMetricsLogger.notifyTransitionStarting(new SparseIntArray(),
+               SystemClock.uptimeMillis());
+
+       mActivityMetricsLogger.notifyWindowsDrawn(mActivityRecordTrampoline.getWindowingMode(),
+               SystemClock.uptimeMillis());
+
+       verify(mLaunchObserver).onActivityLaunchFinished(eq(mActivityRecordTrampoline));
+       verifyNoMoreInteractions(mLaunchObserver);
+    }
+
+    @Test
+    public void testOnActivityLaunchCancelledTrampoline() throws Exception {
+       testOnActivityLaunchedTrampoline();
+
+       mActivityRecordTrampoline.nowVisible = true;
+
+       // Cannot time already-visible activities.
+       mActivityMetricsLogger.notifyActivityLaunched(START_TASK_TO_FRONT,
+               mActivityRecordTrampoline);
+
+       verify(mLaunchObserver).onActivityLaunchCancelled(eq(mActivityRecordTrampoline));
+       verifyNoMoreInteractions(mLaunchObserver);
+    }
+}