Wait for BackgroundThread.getHandler() to be idle to run next

WindowManager related test

Fix: 353460715
Test: This is the test
Flag: NONE - This is the test
Change-Id: I5bbfc7f52cd7b3d466e1cf43c0547aac6078aaee

1 files changed, 4 insertions, 0 deletions

diff --git a/services/tests/wmtests/src/com/android/server/wm/SystemServicesTestRule.java b/services/tests/wmtests/src/com/android/server/wm/SystemServicesTestRule.java
index d5d284783978..b92af876ed22 100644
--- a/services/tests/wmtests/src/com/android/server/wm/SystemServicesTestRule.java
+++ b/services/tests/wmtests/src/com/android/server/wm/SystemServicesTestRule.java
@@ -77,6 +77,7 @@ import android.view.InputChannel;
 import android.view.SurfaceControl;
 
 import com.android.dx.mockito.inline.extended.StaticMockitoSession;
+import com.android.internal.os.BackgroundThread;
 import com.android.server.AnimationThread;
 import com.android.server.DisplayThread;
 import com.android.server.LocalServices;
@@ -553,6 +554,9 @@ public class SystemServicesTestRule implements TestRule {
         // This is a different handler object than the wm.mAnimationHandler above.
         waitHandlerIdle(AnimationThread.getHandler());
         waitHandlerIdle(SurfaceAnimationThread.getHandler());
+        // Some binder calls are posted to BackgroundThread.getHandler(), we should wait for them
+        // to finish to run next test.
+        waitHandlerIdle(BackgroundThread.getHandler());
     }
 
     static void waitHandlerIdle(Handler handler) {