Merge "[Status bar] Delay showing the status bar during dream transition." into udc-dev

packages/SystemUI/src/com/android/systemui/statusbar/phone/dagger/StatusBarViewModule.java

@@ -53,6 +53,7 @@ import com.android.systemui.statusbar.phone.fragment.CollapsedStatusBarFragment;
 import com.android.systemui.statusbar.phone.fragment.CollapsedStatusBarFragmentLogger;
 import com.android.systemui.statusbar.phone.fragment.dagger.StatusBarFragmentComponent;
 import com.android.systemui.statusbar.phone.ongoingcall.OngoingCallController;
+import com.android.systemui.statusbar.pipeline.shared.ui.binder.CollapsedStatusBarViewBinder;
 import com.android.systemui.statusbar.pipeline.shared.ui.viewmodel.CollapsedStatusBarViewModel;
 import com.android.systemui.statusbar.policy.KeyguardStateController;
 import com.android.systemui.statusbar.window.StatusBarWindowStateController;
@@ -158,6 +159,7 @@ public abstract class StatusBarViewModule {
             StatusBarIconController statusBarIconController,
             StatusBarIconController.DarkIconManager.Factory darkIconManagerFactory,
             CollapsedStatusBarViewModel collapsedStatusBarViewModel,
+            CollapsedStatusBarViewBinder collapsedStatusBarViewBinder,
             StatusBarHideIconsForBouncerManager statusBarHideIconsForBouncerManager,
             KeyguardStateController keyguardStateController,
             ShadeViewController shadeViewController,
@@ -182,6 +184,7 @@ public abstract class StatusBarViewModule {
                 statusBarIconController,
                 darkIconManagerFactory,
                 collapsedStatusBarViewModel,
+                collapsedStatusBarViewBinder,
                 statusBarHideIconsForBouncerManager,
                 keyguardStateController,
                 shadeViewController,

packages/SystemUI/src/com/android/systemui/statusbar/phone/fragment/CollapsedStatusBarFragment.java

@@ -14,8 +14,6 @@
 
 package com.android.systemui.statusbar.phone.fragment;
 
-
-
 import static com.android.systemui.statusbar.events.SystemStatusAnimationSchedulerKt.IDLE;
 import static com.android.systemui.statusbar.events.SystemStatusAnimationSchedulerKt.SHOWING_PERSISTENT_DOT;
 
@@ -69,6 +67,7 @@ import com.android.systemui.statusbar.phone.fragment.dagger.StatusBarFragmentCom
 import com.android.systemui.statusbar.phone.ongoingcall.OngoingCallController;
 import com.android.systemui.statusbar.phone.ongoingcall.OngoingCallListener;
 import com.android.systemui.statusbar.pipeline.shared.ui.binder.CollapsedStatusBarViewBinder;
+import com.android.systemui.statusbar.pipeline.shared.ui.binder.StatusBarVisibilityChangeListener;
 import com.android.systemui.statusbar.pipeline.shared.ui.viewmodel.CollapsedStatusBarViewModel;
 import com.android.systemui.statusbar.policy.KeyguardStateController;
 import com.android.systemui.statusbar.window.StatusBarWindowStateController;
@@ -131,6 +130,7 @@ public class CollapsedStatusBarFragment extends Fragment implements CommandQueue
     private final StatusBarIconController mStatusBarIconController;
     private final CarrierConfigTracker mCarrierConfigTracker;
     private final CollapsedStatusBarViewModel mCollapsedStatusBarViewModel;
+    private final CollapsedStatusBarViewBinder mCollapsedStatusBarViewBinder;
     private final StatusBarHideIconsForBouncerManager mStatusBarHideIconsForBouncerManager;
     private final StatusBarIconController.DarkIconManager.Factory mDarkIconManagerFactory;
     private final SecureSettings mSecureSettings;
@@ -182,12 +182,22 @@ public class CollapsedStatusBarFragment extends Fragment implements CommandQueue
      */
     private boolean mWaitingForWindowStateChangeAfterCameraLaunch = false;
 
+    /**
+     * True when a transition from lockscreen to dream has started, but haven't yet received a
+     * status bar window state change afterward.
+     *
+     * Similar to [mWaitingForWindowStateChangeAfterCameraLaunch].
+     */
+    private boolean mTransitionFromLockscreenToDreamStarted = false;
+
     /**
      * Listener that updates {@link #mWaitingForWindowStateChangeAfterCameraLaunch} when it receives
      * a new status bar window state.
      */
-    private final StatusBarWindowStateListener mStatusBarWindowStateListener = state ->
+    private final StatusBarWindowStateListener mStatusBarWindowStateListener = state -> {
         mWaitingForWindowStateChangeAfterCameraLaunch = false;
+        mTransitionFromLockscreenToDreamStarted = false;
+    };
 
     @SuppressLint("ValidFragment")
     public CollapsedStatusBarFragment(
@@ -201,6 +211,7 @@ public class CollapsedStatusBarFragment extends Fragment implements CommandQueue
             StatusBarIconController statusBarIconController,
             StatusBarIconController.DarkIconManager.Factory darkIconManagerFactory,
             CollapsedStatusBarViewModel collapsedStatusBarViewModel,
+            CollapsedStatusBarViewBinder collapsedStatusBarViewBinder,
             StatusBarHideIconsForBouncerManager statusBarHideIconsForBouncerManager,
             KeyguardStateController keyguardStateController,
             ShadeViewController shadeViewController,
@@ -224,6 +235,7 @@ public class CollapsedStatusBarFragment extends Fragment implements CommandQueue
         mFeatureFlags = featureFlags;
         mStatusBarIconController = statusBarIconController;
         mCollapsedStatusBarViewModel = collapsedStatusBarViewModel;
+        mCollapsedStatusBarViewBinder = collapsedStatusBarViewBinder;
         mStatusBarHideIconsForBouncerManager = statusBarHideIconsForBouncerManager;
         mDarkIconManagerFactory = darkIconManagerFactory;
         mKeyguardStateController = keyguardStateController;
@@ -296,8 +308,8 @@ public class CollapsedStatusBarFragment extends Fragment implements CommandQueue
         mCarrierConfigTracker.addCallback(mCarrierConfigCallback);
         mCarrierConfigTracker.addDefaultDataSubscriptionChangedListener(mDefaultDataListener);
 
-        CollapsedStatusBarViewBinder.bind(
+        mCollapsedStatusBarViewBinder.bind(
-                mStatusBar, mCollapsedStatusBarViewModel, this::updateStatusBarVisibilities);
+                mStatusBar, mCollapsedStatusBarViewModel, mStatusBarVisibilityChangeListener);
     }
 
     @Override
@@ -411,6 +423,19 @@ public class CollapsedStatusBarFragment extends Fragment implements CommandQueue
         return mStatusBarFragmentComponent;
     }
 
+    private StatusBarVisibilityChangeListener mStatusBarVisibilityChangeListener =
+            new StatusBarVisibilityChangeListener() {
+        @Override
+        public void onStatusBarVisibilityMaybeChanged() {
+            updateStatusBarVisibilities(/* animate= */ true);
+        }
+
+        @Override
+        public void onTransitionFromLockscreenToDreamStarted() {
+            mTransitionFromLockscreenToDreamStarted = true;
+        }
+    };
+
     @Override
     public void disable(int displayId, int state1, int state2, boolean animate) {
         if (displayId != getContext().getDisplayId()) {
@@ -423,10 +448,6 @@ public class CollapsedStatusBarFragment extends Fragment implements CommandQueue
         updateStatusBarVisibilities(animate);
     }
 
-    private void updateStatusBarVisibilities() {
-        updateStatusBarVisibilities(/* animate= */ true);
-    }
-
     private void updateStatusBarVisibilities(boolean animate) {
         StatusBarVisibilityModel previousModel = mLastModifiedVisibility;
         StatusBarVisibilityModel newModel = calculateInternalModel(mLastSystemVisibility);
@@ -546,6 +567,18 @@ public class CollapsedStatusBarFragment extends Fragment implements CommandQueue
             return true;
         }
 
+        // Similar to [hideIconsForSecureCamera]: When dream is launched over lockscreen, the icons
+        // are momentarily visible because the dream animation has finished, but SysUI has not been
+        // informed that the dream is full-screen. For extra safety, we double-check that we're
+        // still dreaming.
+        final boolean hideIconsForDream =
+                mTransitionFromLockscreenToDreamStarted
+                        && mKeyguardUpdateMonitor.isDreaming()
+                        && mKeyguardStateController.isOccluded();
+        if (hideIconsForDream) {
+            return true;
+        }
+
         // While the status bar is transitioning from lockscreen to an occluded, we don't yet know
         // if the occluding activity is fullscreen or not. If it *is* fullscreen, we don't want to
         // briefly show the status bar just to immediately hide it again. So, we wait for the

packages/SystemUI/src/com/android/systemui/statusbar/pipeline/dagger/StatusBarPipelineModule.kt

@@ -44,6 +44,8 @@ import com.android.systemui.statusbar.pipeline.mobile.util.SubscriptionManagerPr
 import com.android.systemui.statusbar.pipeline.mobile.util.SubscriptionManagerProxyImpl
 import com.android.systemui.statusbar.pipeline.shared.data.repository.ConnectivityRepository
 import com.android.systemui.statusbar.pipeline.shared.data.repository.ConnectivityRepositoryImpl
+import com.android.systemui.statusbar.pipeline.shared.ui.binder.CollapsedStatusBarViewBinder
+import com.android.systemui.statusbar.pipeline.shared.ui.binder.CollapsedStatusBarViewBinderImpl
 import com.android.systemui.statusbar.pipeline.wifi.data.repository.RealWifiRepository
 import com.android.systemui.statusbar.pipeline.wifi.data.repository.WifiRepository
 import com.android.systemui.statusbar.pipeline.wifi.data.repository.WifiRepositorySwitcher
@@ -107,6 +109,11 @@ abstract class StatusBarPipelineModule {
         impl: CollapsedStatusBarViewModelImpl
     ): CollapsedStatusBarViewModel
 
+    @Binds
+    abstract fun collapsedStatusBarViewBinder(
+        impl: CollapsedStatusBarViewBinderImpl
+    ): CollapsedStatusBarViewBinder
+
     companion object {
         @Provides
         @SysUISingleton

packages/SystemUI/src/com/android/systemui/statusbar/pipeline/shared/ui/binder/CollapsedStatusBarViewBinder.kt

@@ -19,34 +19,61 @@ package com.android.systemui.statusbar.pipeline.shared.ui.binder
 import android.view.View
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.repeatOnLifecycle
+import com.android.systemui.dagger.SysUISingleton
 import com.android.systemui.lifecycle.repeatWhenAttached
 import com.android.systemui.statusbar.pipeline.shared.ui.viewmodel.CollapsedStatusBarViewModel
+import javax.inject.Inject
+import kotlinx.coroutines.launch
 
-object CollapsedStatusBarViewBinder {
+/**
+ * Interface to assist with binding the [CollapsedStatusBarFragment] to
+ * [CollapsedStatusBarViewModel]. Used only to enable easy testing of [CollapsedStatusBarFragment].
+ */
+interface CollapsedStatusBarViewBinder {
     /**
      * Binds the view to the view-model. [listener] will be notified whenever an event that may
      * change the status bar visibility occurs.
      */
-    @JvmStatic
     fun bind(
         view: View,
         viewModel: CollapsedStatusBarViewModel,
         listener: StatusBarVisibilityChangeListener,
+    )
+}
+
+@SysUISingleton
+class CollapsedStatusBarViewBinderImpl @Inject constructor() : CollapsedStatusBarViewBinder {
+    override fun bind(
+        view: View,
+        viewModel: CollapsedStatusBarViewModel,
+        listener: StatusBarVisibilityChangeListener,
     ) {
         view.repeatWhenAttached {
             repeatOnLifecycle(Lifecycle.State.CREATED) {
+                launch {
                     viewModel.isTransitioningFromLockscreenToOccluded.collect {
                         listener.onStatusBarVisibilityMaybeChanged()
                     }
                 }
+
+                launch {
+                    viewModel.transitionFromLockscreenToDreamStartedEvent.collect {
+                        listener.onTransitionFromLockscreenToDreamStarted()
+                    }
+                }
+            }
         }
     }
 }
 
+/** Listener for various events that may affect the status bar's visibility. */
+interface StatusBarVisibilityChangeListener {
     /**
- * Listener to be notified when the status bar visibility might have changed due to the device
+     * Called when the status bar visibility might have changed due to the device moving to a
- * moving to a different state.
+     * different state.
      */
-fun interface StatusBarVisibilityChangeListener {
     fun onStatusBarVisibilityMaybeChanged()
+
+    /** Called when a transition from lockscreen to dream has started. */
+    fun onTransitionFromLockscreenToDreamStarted()
 }

packages/SystemUI/src/com/android/systemui/statusbar/pipeline/shared/ui/viewmodel/CollapsedStatusBarViewModel.kt

@@ -22,8 +22,10 @@ import com.android.systemui.keyguard.domain.interactor.KeyguardTransitionInterac
 import com.android.systemui.keyguard.shared.model.TransitionState
 import javax.inject.Inject
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 
@@ -43,6 +45,9 @@ interface CollapsedStatusBarViewModel {
      * otherwise.
      */
     val isTransitioningFromLockscreenToOccluded: StateFlow<Boolean>
+
+    /** Emits whenever a transition from lockscreen to dream has started. */
+    val transitionFromLockscreenToDreamStartedEvent: Flow<Unit>
 }
 
 @SysUISingleton
@@ -59,4 +64,9 @@ constructor(
                     it.transitionState == TransitionState.RUNNING
             }
             .stateIn(coroutineScope, SharingStarted.WhileSubscribed(), initialValue = false)
+
+    override val transitionFromLockscreenToDreamStartedEvent: Flow<Unit> =
+        keyguardTransitionInteractor.lockscreenToDreamingTransition
+            .filter { it.transitionState == TransitionState.STARTED }
+            .map {}
 }

packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/fragment/CollapsedStatusBarFragmentTest.java

@@ -74,6 +74,7 @@ import com.android.systemui.statusbar.phone.StatusBarIconController;
 import com.android.systemui.statusbar.phone.StatusBarLocationPublisher;
 import com.android.systemui.statusbar.phone.fragment.dagger.StatusBarFragmentComponent;
 import com.android.systemui.statusbar.phone.ongoingcall.OngoingCallController;
+import com.android.systemui.statusbar.pipeline.shared.ui.viewmodel.FakeCollapsedStatusBarViewBinder;
 import com.android.systemui.statusbar.pipeline.shared.ui.viewmodel.FakeCollapsedStatusBarViewModel;
 import com.android.systemui.statusbar.policy.KeyguardStateController;
 import com.android.systemui.statusbar.window.StatusBarWindowStateController;
@@ -129,6 +130,7 @@ public class CollapsedStatusBarFragmentTest extends SysuiBaseFragmentTest {
     @Mock
     private StatusBarIconController.DarkIconManager mIconManager;
     private FakeCollapsedStatusBarViewModel mCollapsedStatusBarViewModel;
+    private FakeCollapsedStatusBarViewBinder mCollapsedStatusBarViewBinder;
     @Mock
     private StatusBarHideIconsForBouncerManager mStatusBarHideIconsForBouncerManager;
     @Mock
@@ -612,6 +614,55 @@ public class CollapsedStatusBarFragmentTest extends SysuiBaseFragmentTest {
         assertEquals(View.VISIBLE, getClockView().getVisibility());
     }
 
+    @Test
+    public void testStatusBarIcons_hiddenThroughoutLockscreenToDreamTransition() {
+        final CollapsedStatusBarFragment fragment = resumeAndGetFragment();
+
+        // WHEN a transition to dream has started
+        mCollapsedStatusBarViewBinder.getListener().onTransitionFromLockscreenToDreamStarted();
+        when(mKeyguardUpdateMonitor.isDreaming()).thenReturn(true);
+        when(mKeyguardStateController.isOccluded()).thenReturn(true);
+        fragment.disable(DEFAULT_DISPLAY, 0, 0, false);
+
+        // THEN status icons should be invisible or gone, but certainly not VISIBLE.
+        assertNotEquals(View.VISIBLE, getEndSideContentView().getVisibility());
+        assertNotEquals(View.VISIBLE, getClockView().getVisibility());
+
+        // WHEN the transition has finished and dream is displaying
+        mockLockscreenToDreamTransitionFinished();
+        // (This approximates "dream is displaying")
+        when(mStatusBarHideIconsForBouncerManager.getShouldHideStatusBarIconsForBouncer())
+                .thenReturn(true);
+        fragment.disable(DEFAULT_DISPLAY, 0, 0, false);
+
+        // THEN the views still aren't visible because dream is hiding them
+        assertNotEquals(View.VISIBLE, getEndSideContentView().getVisibility());
+        assertNotEquals(View.VISIBLE, getClockView().getVisibility());
+
+        // WHEN dream has ended
+        when(mStatusBarHideIconsForBouncerManager.getShouldHideStatusBarIconsForBouncer())
+                .thenReturn(false);
+        fragment.disable(DEFAULT_DISPLAY, 0, 0, false);
+
+        // THEN the views can be visible again
+        assertEquals(View.VISIBLE, getEndSideContentView().getVisibility());
+        assertEquals(View.VISIBLE, getClockView().getVisibility());
+    }
+
+    @Test
+    public void testStatusBarIcons_lockscreenToDreamTransitionButNotDreaming_iconsVisible() {
+        final CollapsedStatusBarFragment fragment = resumeAndGetFragment();
+
+        // WHEN a transition to dream has started but we're *not* dreaming
+        mCollapsedStatusBarViewBinder.getListener().onTransitionFromLockscreenToDreamStarted();
+        when(mKeyguardUpdateMonitor.isDreaming()).thenReturn(false);
+        fragment.disable(DEFAULT_DISPLAY, 0, 0, false);
+
+        // THEN the views are still visible
+        assertEquals(View.VISIBLE, getEndSideContentView().getVisibility());
+        assertEquals(View.VISIBLE, getClockView().getVisibility());
+    }
+
     @Override
     protected Fragment instantiate(Context context, String className, Bundle arguments) {
         MockitoAnnotations.initMocks(this);
@@ -631,6 +682,7 @@ public class CollapsedStatusBarFragmentTest extends SysuiBaseFragmentTest {
 
         mShadeExpansionStateManager = new ShadeExpansionStateManager();
         mCollapsedStatusBarViewModel = new FakeCollapsedStatusBarViewModel();
+        mCollapsedStatusBarViewBinder = new FakeCollapsedStatusBarViewBinder();
 
         setUpNotificationIconAreaController();
         return new CollapsedStatusBarFragment(
@@ -644,6 +696,7 @@ public class CollapsedStatusBarFragmentTest extends SysuiBaseFragmentTest {
                 mStatusBarIconController,
                 mIconManagerFactory,
                 mCollapsedStatusBarViewModel,
+                mCollapsedStatusBarViewBinder,
                 mStatusBarHideIconsForBouncerManager,
                 mKeyguardStateController,
                 mShadeViewController,
@@ -718,6 +771,12 @@ public class CollapsedStatusBarFragmentTest extends SysuiBaseFragmentTest {
         }
     }
 
+    private void mockLockscreenToDreamTransitionFinished() {
+        for (StatusBarWindowStateListener listener : mStatusBarWindowStateListeners) {
+            listener.onStatusBarWindowStateChanged(StatusBarManager.WINDOW_STATE_HIDDEN);
+        }
+    }
+
     private CollapsedStatusBarFragment resumeAndGetFragment() {
         mFragments.dispatchResume();
         processAllMessages();

packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/shared/ui/viewmodel/CollapsedStatusBarViewModelImplTest.kt

@@ -18,6 +18,7 @@ package com.android.systemui.statusbar.pipeline.shared.ui.viewmodel
 
 import androidx.test.filters.SmallTest
 import com.android.systemui.SysuiTestCase
+import com.android.systemui.coroutines.collectValues
 import com.android.systemui.keyguard.data.repository.FakeKeyguardTransitionRepository
 import com.android.systemui.keyguard.domain.interactor.KeyguardTransitionInteractor
 import com.android.systemui.keyguard.shared.model.KeyguardState
@@ -176,4 +177,139 @@ class CollapsedStatusBarViewModelImplTest : SysuiTestCase() {
 
             job.cancel()
         }
+
+    @Test
+    fun transitionFromLockscreenToDreamStartedEvent_started_emitted() =
+        testScope.runTest {
+            val emissions by collectValues(underTest.transitionFromLockscreenToDreamStartedEvent)
+
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    KeyguardState.LOCKSCREEN,
+                    KeyguardState.DREAMING,
+                    value = 0f,
+                    TransitionState.STARTED,
+                )
+            )
+
+            assertThat(emissions.size).isEqualTo(1)
+        }
+
+    @Test
+    fun transitionFromLockscreenToDreamStartedEvent_startedMultiple_emittedMultiple() =
+        testScope.runTest {
+            val emissions by collectValues(underTest.transitionFromLockscreenToDreamStartedEvent)
+
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    KeyguardState.LOCKSCREEN,
+                    KeyguardState.DREAMING,
+                    value = 0f,
+                    TransitionState.STARTED,
+                )
+            )
+
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    KeyguardState.LOCKSCREEN,
+                    KeyguardState.DREAMING,
+                    value = 0f,
+                    TransitionState.STARTED,
+                )
+            )
+
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    KeyguardState.LOCKSCREEN,
+                    KeyguardState.DREAMING,
+                    value = 0f,
+                    TransitionState.STARTED,
+                )
+            )
+
+            assertThat(emissions.size).isEqualTo(3)
+        }
+
+    @Test
+    fun transitionFromLockscreenToDreamStartedEvent_startedThenRunning_emittedOnlyOne() =
+        testScope.runTest {
+            val emissions by collectValues(underTest.transitionFromLockscreenToDreamStartedEvent)
+
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    KeyguardState.LOCKSCREEN,
+                    KeyguardState.DREAMING,
+                    value = 0f,
+                    TransitionState.STARTED,
+                )
+            )
+            assertThat(emissions.size).isEqualTo(1)
+
+            // WHEN the transition progresses through its animation by going through the RUNNING
+            // step with increasing fractions
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    KeyguardState.LOCKSCREEN,
+                    KeyguardState.DREAMING,
+                    value = .1f,
+                    TransitionState.RUNNING,
+                )
+            )
+
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    KeyguardState.LOCKSCREEN,
+                    KeyguardState.DREAMING,
+                    value = .2f,
+                    TransitionState.RUNNING,
+                )
+            )
+
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    KeyguardState.LOCKSCREEN,
+                    KeyguardState.DREAMING,
+                    value = .3f,
+                    TransitionState.RUNNING,
+                )
+            )
+
+            // THEN the flow does not emit since the flow should only emit when the transition
+            // starts
+            assertThat(emissions.size).isEqualTo(1)
+        }
+
+    @Test
+    fun transitionFromLockscreenToDreamStartedEvent_irrelevantTransition_notEmitted() =
+        testScope.runTest {
+            val emissions by collectValues(underTest.transitionFromLockscreenToDreamStartedEvent)
+
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    KeyguardState.LOCKSCREEN,
+                    KeyguardState.OCCLUDED,
+                    value = 0f,
+                    TransitionState.STARTED,
+                )
+            )
+
+            assertThat(emissions).isEmpty()
+        }
+
+    @Test
+    fun transitionFromLockscreenToDreamStartedEvent_irrelevantTransitionState_notEmitted() =
+        testScope.runTest {
+            val emissions by collectValues(underTest.transitionFromLockscreenToDreamStartedEvent)
+
+            keyguardTransitionRepository.sendTransitionStep(
+                TransitionStep(
+                    KeyguardState.LOCKSCREEN,
+                    KeyguardState.DREAMING,
+                    value = 1.0f,
+                    TransitionState.FINISHED,
+                )
+            )
+
+            assertThat(emissions).isEmpty()
+        }
 }

packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/shared/ui/viewmodel/FakeCollapsedStatusBarViewBinder.kt

@@ -0,0 +1,39 @@
+/*
+ * 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.statusbar.pipeline.shared.ui.viewmodel
+
+import android.view.View
+import com.android.systemui.statusbar.pipeline.shared.ui.binder.CollapsedStatusBarViewBinder
+import com.android.systemui.statusbar.pipeline.shared.ui.binder.StatusBarVisibilityChangeListener
+
+/**
+ * A fake view binder that can be used from Java tests.
+ *
+ * Since Java tests can't run tests within test scopes, we need to bypass the flows from
+ * [CollapsedStatusBarViewModel] and just trigger the listener directly.
+ */
+class FakeCollapsedStatusBarViewBinder : CollapsedStatusBarViewBinder {
+    var listener: StatusBarVisibilityChangeListener? = null
+
+    override fun bind(
+        view: View,
+        viewModel: CollapsedStatusBarViewModel,
+        listener: StatusBarVisibilityChangeListener,
+    ) {
+        this.listener = listener
+    }
+}

packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/shared/ui/viewmodel/FakeCollapsedStatusBarViewModel.kt

@@ -16,8 +16,11 @@
 
 package com.android.systemui.statusbar.pipeline.shared.ui.viewmodel
 
+import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
 
 class FakeCollapsedStatusBarViewModel : CollapsedStatusBarViewModel {
     override val isTransitioningFromLockscreenToOccluded = MutableStateFlow(false)
+
+    override val transitionFromLockscreenToDreamStartedEvent = MutableSharedFlow<Unit>()
 }