diff --git a/services/core/java/com/android/server/dreams/DreamManagerService.java b/services/core/java/com/android/server/dreams/DreamManagerService.java
index d2aff25..c6d66db 100644
--- a/services/core/java/com/android/server/dreams/DreamManagerService.java
+++ b/services/core/java/com/android/server/dreams/DreamManagerService.java
@@ -67,6 +67,7 @@
 
 import com.android.internal.R;
 import com.android.internal.annotations.GuardedBy;
+import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.logging.UiEventLogger;
 import com.android.internal.logging.UiEventLoggerImpl;
 import com.android.internal.util.DumpUtils;
@@ -112,7 +113,7 @@
     private final Object mLock = new Object();
 
     private final Context mContext;
-    private final DreamHandler mHandler;
+    private final Handler mHandler;
     private final DreamController mController;
     private final PowerManager mPowerManager;
     private final PowerManagerInternal mPowerManagerInternal;
@@ -211,9 +212,14 @@
     }
 
     public DreamManagerService(Context context) {
+        this(context, new DreamHandler(FgThread.get().getLooper()));
+    }
+
+    @VisibleForTesting
+    DreamManagerService(Context context, Handler handler) {
         super(context);
         mContext = context;
-        mHandler = new DreamHandler(FgThread.get().getLooper());
+        mHandler = handler;
         mController = new DreamController(context, mHandler, mControllerListener);
 
         mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
@@ -244,7 +250,6 @@
                 com.android.internal.R.bool.config_keepDreamingWhenUnplugging);
         mDreamsDisabledByAmbientModeSuppressionConfig = mContext.getResources().getBoolean(
                 com.android.internal.R.bool.config_dreamsDisabledByAmbientModeSuppressionConfig);
-
     }
 
     @Override
diff --git a/services/tests/dreamservicetests/Android.bp b/services/tests/dreamservicetests/Android.bp
index 5aa5d61..86b3a6c 100644
--- a/services/tests/dreamservicetests/Android.bp
+++ b/services/tests/dreamservicetests/Android.bp
@@ -18,6 +18,11 @@
         "mockito-target-minus-junit4",
         "services.core",
         "mockingservicestests-utils-mockito",
+        "servicestests-utils",
+    ],
+
+    defaults: [
+        "modules-utils-testable-device-config-defaults",
     ],
 
     platform_apis: true,
diff --git a/services/tests/dreamservicetests/AndroidManifest.xml b/services/tests/dreamservicetests/AndroidManifest.xml
index f4b88d9..6092ef6 100644
--- a/services/tests/dreamservicetests/AndroidManifest.xml
+++ b/services/tests/dreamservicetests/AndroidManifest.xml
@@ -21,6 +21,7 @@
     Insert permissions here. eg:
     <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />
     -->
+    <uses-permission android:name="android.permission.INTERACT_ACROSS_USERS_FULL" />
 
     <application android:debuggable="true"
                  android:testOnly="true">
diff --git a/services/tests/dreamservicetests/src/com/android/server/dreams/DreamManagerServiceMockingTest.java b/services/tests/dreamservicetests/src/com/android/server/dreams/DreamManagerServiceMockingTest.java
index 32d4e75..992b853 100644
--- a/services/tests/dreamservicetests/src/com/android/server/dreams/DreamManagerServiceMockingTest.java
+++ b/services/tests/dreamservicetests/src/com/android/server/dreams/DreamManagerServiceMockingTest.java
@@ -36,13 +36,14 @@
 import android.provider.Settings;
 
 import androidx.test.InstrumentationRegistry;
-import androidx.test.filters.FlakyTest;
 
-import com.android.server.LocalServices;
+import com.android.internal.util.test.LocalServiceKeeperRule;
 import com.android.server.SystemService;
+import com.android.server.testutils.TestHandler;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
@@ -65,23 +66,24 @@
     @Mock
     private UserManager mUserManagerMock;
 
-    private MockitoSession mMockitoSession;
+    @Rule
+    public LocalServiceKeeperRule mLocalServiceKeeperRule = new LocalServiceKeeperRule();
 
-    private static <T> void addLocalServiceMock(Class<T> clazz, T mock) {
-        LocalServices.removeServiceForTest(clazz);
-        LocalServices.addService(clazz, mock);
-    }
+    private TestHandler mTestHandler;
+    private MockitoSession mMockitoSession;
 
     @Before
     public void setUp() throws Exception {
+        mTestHandler = new TestHandler(/* callback= */ null);
         MockitoAnnotations.initMocks(this);
-
         mContextSpy = spy(new ContextWrapper(InstrumentationRegistry.getContext()));
         mResourcesSpy = spy(mContextSpy.getResources());
         when(mContextSpy.getResources()).thenReturn(mResourcesSpy);
 
-        addLocalServiceMock(ActivityManagerInternal.class, mActivityManagerInternalMock);
-        addLocalServiceMock(PowerManagerInternal.class, mPowerManagerInternalMock);
+        mLocalServiceKeeperRule.overrideLocalService(
+                ActivityManagerInternal.class, mActivityManagerInternalMock);
+        mLocalServiceKeeperRule.overrideLocalService(
+                PowerManagerInternal.class, mPowerManagerInternalMock);
 
         when(mContextSpy.getSystemService(UserManager.class)).thenReturn(mUserManagerMock);
         mMockitoSession = mockitoSession()
@@ -94,26 +96,20 @@
     @After
     public void tearDown() throws Exception {
         mMockitoSession.finishMocking();
-        LocalServices.removeServiceForTest(ActivityManagerInternal.class);
-        LocalServices.removeServiceForTest(PowerManagerInternal.class);
     }
 
     private DreamManagerService createService() {
-        return new DreamManagerService(mContextSpy);
+        return new DreamManagerService(mContextSpy, mTestHandler);
     }
 
     @Test
-    @FlakyTest(bugId = 293443309)
     public void testSettingsQueryUserChange() {
         final DreamManagerService service = createService();
-
         final SystemService.TargetUser from =
                 new SystemService.TargetUser(mock(UserInfo.class));
         final SystemService.TargetUser to =
                 new SystemService.TargetUser(mock(UserInfo.class));
-
         service.onUserSwitching(from, to);
-
         verify(() -> Settings.Secure.getIntForUser(any(),
                 eq(Settings.Secure.SCREENSAVER_ENABLED),
                 anyInt(),