Set DreamsActivateOnSleepSetting and handle Sandman in tests

Two PowerManagerServiceTest were failing on TV:
- testRemovedDisplayGroupWakeLock_affectsNoDisplayGroups
- testWakeLock_affectsProperDisplayGroup

These tests expected the device to be DOZING at the end of the test,
but the devices was found to be DREAMING.
This difference came from `mDreamsActivateOnSleepSetting`, which was
not set for phones, but is set on TV.
Two tests are added to test the behaviour of this setting.

This CL also changes a call to `Handler#sendMessage` to
`Handler#sendMessageAtTime`, which schedules the message according to
the time of the test clock, instead of the real SystemClock.
This causes `handleSandman` to actually run during the test,
which would put the device to sleep if DOZING and dream couldn't be
started, so when #startDream is called on the DreamManager mock,
we set #isDreaming on the mock.

Bug: 205837239
Test: atest PowerManagerServiceTest
Change-Id: I6f27ea6a5cf8ddb1b7735c8d6ef67f27a5eb3747

services/core/java/com/android/server/power/PowerManagerService.java

@@ -1998,7 +1998,7 @@ public final class PowerManagerService extends SystemService
     private boolean dozePowerGroupLocked(final PowerGroup powerGroup, long eventTime,
             int reason, int uid) {
         if (DEBUG_SPEW) {
-            Slog.d(TAG, "sleepDisplayGroupNoUpdateLocked: eventTime=" + eventTime
+            Slog.d(TAG, "dozePowerGroup: eventTime=" + eventTime
                     + ", groupId=" + powerGroup.getGroupId() + ", reason=" + reason
                     + ", uid=" + uid);
         }
@@ -3127,7 +3127,7 @@ public final class PowerManagerService extends SystemService
                     Message msg = mHandler.obtainMessage(MSG_SANDMAN);
                     msg.arg1 = powerGroup.getGroupId();
                     msg.setAsynchronous(true);
-                    mHandler.sendMessage(msg);
+                    mHandler.sendMessageAtTime(msg, mClock.uptimeMillis());
                 }
             }
         }

services/tests/servicestests/src/com/android/server/power/PowerManagerServiceTest.java

@@ -213,6 +213,8 @@ public class PowerManagerServiceTest {
 
         Settings.Global.putInt(mContextSpy.getContentResolver(),
                 Settings.Global.STAY_ON_WHILE_PLUGGED_IN, 0);
+        Settings.Secure.putInt(mContextSpy.getContentResolver(),
+                Settings.Secure.SCREENSAVER_ACTIVATE_ON_SLEEP, 0);
 
         mClock = new OffsettableClock.Stopped();
         mTestLooper = new TestLooper(mClock::now);
@@ -725,6 +727,48 @@ public class PowerManagerServiceTest {
         assertThat(mService.getBinderServiceInstance().forceSuspend()).isFalse();
     }
 
+    @SuppressWarnings("GuardedBy")
+    @Test
+    public void testScreensaverActivateOnSleepDisabled_powered_afterTimeout_goesToDozing() {
+        when(mBatteryManagerInternalMock.isPowered(anyInt())).thenReturn(true);
+
+        doAnswer(inv -> {
+            when(mDreamManagerInternalMock.isDreaming()).thenReturn(true);
+            return null;
+        }).when(mDreamManagerInternalMock).startDream(anyBoolean());
+
+        setMinimumScreenOffTimeoutConfig(5);
+        createService();
+        startSystem();
+
+        assertThat(mService.getGlobalWakefulnessLocked()).isEqualTo(WAKEFULNESS_AWAKE);
+
+        advanceTime(15000);
+        assertThat(mService.getGlobalWakefulnessLocked()).isEqualTo(WAKEFULNESS_DOZING);
+    }
+
+    @SuppressWarnings("GuardedBy")
+    @Test
+    public void testScreensaverActivateOnSleepEnabled_powered_afterTimeout_goesToDreaming() {
+        when(mBatteryManagerInternalMock.isPowered(anyInt())).thenReturn(true);
+        Settings.Secure.putInt(mContextSpy.getContentResolver(),
+                Settings.Secure.SCREENSAVER_ACTIVATE_ON_SLEEP, 1);
+
+        doAnswer(inv -> {
+            when(mDreamManagerInternalMock.isDreaming()).thenReturn(true);
+            return null;
+        }).when(mDreamManagerInternalMock).startDream(anyBoolean());
+
+        setMinimumScreenOffTimeoutConfig(5);
+        createService();
+        startSystem();
+
+        assertThat(mService.getGlobalWakefulnessLocked()).isEqualTo(WAKEFULNESS_AWAKE);
+
+        advanceTime(15000);
+        assertThat(mService.getGlobalWakefulnessLocked()).isEqualTo(WAKEFULNESS_DREAMING);
+    }
+
     @Test
     public void testSetDozeOverrideFromDreamManager_triggersSuspendBlocker() {
         final String suspendBlockerName = "PowerManagerService.Display";
@@ -1152,6 +1196,11 @@ public class PowerManagerServiceTest {
         info.displayGroupId = nonDefaultDisplayGroupId;
         when(mDisplayManagerInternalMock.getDisplayInfo(nonDefaultDisplay)).thenReturn(info);
 
+        doAnswer(inv -> {
+            when(mDreamManagerInternalMock.isDreaming()).thenReturn(true);
+            return null;
+        }).when(mDreamManagerInternalMock).startDream(anyBoolean());
+
         final String pkg = mContextSpy.getOpPackageName();
         final Binder token = new Binder();
         final String tag = "testRemovedDisplayGroupWakeLock_affectsNoDisplayGroups";