Merge "Reduce use of static variables in window manager unit tests" into oc-dev (2fcba5d9) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/wm/WindowManagerService.java

+4 −1

Original line number	Diff line number	Diff line
		@@ -4318,7 +4318,10 @@ public class WindowManagerService extends IWindowManager.Stub
		if (mWaitingForConfig) {
		mWaitingForConfig = false;
		mLastFinishedFreezeSource = "config-unchanged";
		mRoot.getDisplayContent(displayId).setLayoutNeeded();
		final DisplayContent dc = mRoot.getDisplayContent(displayId);
		if (dc != null) {
		dc.setLayoutNeeded();
		}
		mWindowPlacerLocked.performSurfacePlacement();
		}
		}

services/tests/servicestests/src/com/android/server/wm/AppBoundsTests.java

+8 −9

Original line number	Diff line number	Diff line
		@@ -19,7 +19,6 @@ package com.android.server.wm;
		import android.app.ActivityManager;
		import android.content.res.Configuration;
		import android.graphics.Rect;
		import android.os.Debug;
		import android.view.DisplayInfo;
		import org.junit.Test;

		@@ -53,11 +52,11 @@ public class AppBoundsTests extends WindowTestsBase {
		*/
		@Test
		public void testRootConfigurationBounds() throws Exception {
		final DisplayInfo info = sDisplayContent.getDisplayInfo();
		final DisplayInfo info = mDisplayContent.getDisplayInfo();
		info.appWidth = 1024;
		info.appHeight = 768;

		final Configuration config = sWm.computeNewConfiguration(sDisplayContent.getDisplayId());
		final Configuration config = sWm.computeNewConfiguration(mDisplayContent.getDisplayId());
		// The bounds should always be positioned in the top left.
		assertEquals(config.appBounds.left, 0);
		assertEquals(config.appBounds.top, 0);
		@@ -116,8 +115,8 @@ public class AppBoundsTests extends WindowTestsBase {
		*/
		@Test
		public void testFullScreenFreeFormBounds() throws Exception {
		final Rect fullScreenBounds = new Rect(0, 0, sDisplayInfo.logicalWidth,
		sDisplayInfo.logicalHeight);
		final Rect fullScreenBounds = new Rect(0, 0, mDisplayInfo.logicalWidth,
		mDisplayInfo.logicalHeight);
		testStackBoundsConfiguration(null /stackId/, mParentBounds, fullScreenBounds,
		mParentBounds);
		}
		@@ -126,16 +125,16 @@ public class AppBoundsTests extends WindowTestsBase {
		private void testStackBoundsConfiguration(Integer stackId, Rect parentBounds, Rect bounds,
		Rect expectedConfigBounds) {
		final StackWindowController stackController = stackId != null ?
		createStackControllerOnStackOnDisplay(stackId, sDisplayContent)
		: createStackControllerOnDisplay(sDisplayContent);
		createStackControllerOnStackOnDisplay(stackId, mDisplayContent)
		: createStackControllerOnDisplay(mDisplayContent);

		final Configuration parentConfig = sDisplayContent.getConfiguration();
		final Configuration parentConfig = mDisplayContent.getConfiguration();
		parentConfig.setAppBounds(parentBounds);

		final Configuration config = new Configuration();
		stackController.adjustConfigurationForBounds(bounds, null /insetBounds/,
		new Rect() /nonDecorBounds/, new Rect() /stableBounds/, false /overrideWidth/,
		false /overrideHeight/, sDisplayInfo.logicalDensityDpi, config, parentConfig);
		false /overrideHeight/, mDisplayInfo.logicalDensityDpi, config, parentConfig);
		// Assert that both expected and actual are null or are equal to each other

		assertTrue((expectedConfigBounds == null && config.appBounds == null)

services/tests/servicestests/src/com/android/server/wm/AppWindowContainerControllerTests.java

+14 −13

Original line number	Diff line number	Diff line
		@@ -48,14 +48,14 @@ public class AppWindowContainerControllerTests extends WindowTestsBase {
		createAppWindowController();

		// Assert token was added to display.
		assertNotNull(sDisplayContent.getWindowToken(controller.mToken.asBinder()));
		assertNotNull(mDisplayContent.getWindowToken(controller.mToken.asBinder()));
		// Assert that the container was created and linked.
		assertNotNull(controller.mContainer);

		controller.removeContainer(sDisplayContent.getDisplayId());
		controller.removeContainer(mDisplayContent.getDisplayId());

		// Assert token was remove from display.
		assertNull(sDisplayContent.getWindowToken(controller.mToken.asBinder()));
		assertNull(mDisplayContent.getWindowToken(controller.mToken.asBinder()));
		// Assert that the container was removed.
		assertNull(controller.mContainer);
		}
		@@ -68,11 +68,11 @@ public class AppWindowContainerControllerTests extends WindowTestsBase {
		// Assert orientation is unspecified to start.
		assertEquals(SCREEN_ORIENTATION_UNSPECIFIED, controller.getOrientation());

		controller.setOrientation(SCREEN_ORIENTATION_LANDSCAPE, sDisplayContent.getDisplayId(),
		controller.setOrientation(SCREEN_ORIENTATION_LANDSCAPE, mDisplayContent.getDisplayId(),
		EMPTY /* displayConfig /, false / freezeScreenIfNeeded */);
		assertEquals(SCREEN_ORIENTATION_LANDSCAPE, controller.getOrientation());

		controller.removeContainer(sDisplayContent.getDisplayId());
		controller.removeContainer(mDisplayContent.getDisplayId());
		// Assert orientation is unspecified to after container is removed.
		assertEquals(SCREEN_ORIENTATION_UNSPECIFIED, controller.getOrientation());

		@@ -99,7 +99,7 @@ public class AppWindowContainerControllerTests extends WindowTestsBase {
		controller.addStartingWindow(InstrumentationRegistry.getContext().getPackageName(),
		android.R.style.Theme, null, "Test", 0, 0, 0, 0, null, true, true, false, true);
		waitUntilHandlersIdle();
		final AppWindowToken atoken = controller.getAppWindowToken();
		final AppWindowToken atoken = controller.getAppWindowToken(mDisplayContent);
		assertHasStartingWindow(atoken);
		controller.removeStartingWindow();
		waitUntilHandlersIdle();
		@@ -119,8 +119,8 @@ public class AppWindowContainerControllerTests extends WindowTestsBase {
		android.R.style.Theme, null, "Test", 0, 0, 0, 0, controller1.mToken.asBinder(),
		true, true, false, true);
		waitUntilHandlersIdle();
		assertNoStartingWindow(controller1.getAppWindowToken());
		assertHasStartingWindow(controller2.getAppWindowToken());
		assertNoStartingWindow(controller1.getAppWindowToken(mDisplayContent));
		assertHasStartingWindow(controller2.getAppWindowToken(mDisplayContent));
		}

		@Test
		@@ -129,7 +129,7 @@ public class AppWindowContainerControllerTests extends WindowTestsBase {
		createAppWindowController();
		final WindowTestUtils.TestAppWindowContainerController controller2 =
		createAppWindowController();
		sPolicy.setRunnableWhenAddingSplashScreen(() -> {
		((TestWindowManagerPolicy) sWm.mPolicy).setRunnableWhenAddingSplashScreen(() -> {

		// Surprise, ...! Transfer window in the middle of the creation flow.
		controller2.addStartingWindow(InstrumentationRegistry.getContext().getPackageName(),
		@@ -139,14 +139,14 @@ public class AppWindowContainerControllerTests extends WindowTestsBase {
		controller1.addStartingWindow(InstrumentationRegistry.getContext().getPackageName(),
		android.R.style.Theme, null, "Test", 0, 0, 0, 0, null, true, true, false, true);
		waitUntilHandlersIdle();
		assertNoStartingWindow(controller1.getAppWindowToken());
		assertHasStartingWindow(controller2.getAppWindowToken());
		assertNoStartingWindow(controller1.getAppWindowToken(mDisplayContent));
		assertHasStartingWindow(controller2.getAppWindowToken(mDisplayContent));
		}

		@Test
		public void testReparent() throws Exception {
		final StackWindowController stackController =
		createStackControllerOnDisplay(sDisplayContent);
		createStackControllerOnDisplay(mDisplayContent);
		final WindowTestUtils.TestTaskWindowContainerController taskController1 =
		new WindowTestUtils.TestTaskWindowContainerController(stackController);
		final WindowTestUtils.TestAppWindowContainerController appWindowController1 =
		@@ -183,7 +183,8 @@ public class AppWindowContainerControllerTests extends WindowTestsBase {
		}

		private WindowTestUtils.TestAppWindowContainerController createAppWindowController() {
		return createAppWindowController(new WindowTestUtils.TestTaskWindowContainerController());
		return createAppWindowController(
		new WindowTestUtils.TestTaskWindowContainerController(this));
		}

		private WindowTestUtils.TestAppWindowContainerController createAppWindowController(

services/tests/servicestests/src/com/android/server/wm/AppWindowTokenTests.java

+11 −12

Original line number	Diff line number	Diff line
		@@ -17,7 +17,6 @@
		package com.android.server.wm;

		import org.junit.Test;
		import org.junit.Ignore;
		import org.junit.runner.RunWith;

		import android.platform.test.annotations.Presubmit;
		@@ -52,7 +51,7 @@ public class AppWindowTokenTests extends WindowTestsBase {
		@Test
		public void testAddWindow_Order() throws Exception {
		final WindowTestUtils.TestAppWindowToken token =
		new WindowTestUtils.TestAppWindowToken(sDisplayContent);
		new WindowTestUtils.TestAppWindowToken(mDisplayContent);

		assertEquals(0, token.getWindowsCount());

		@@ -80,7 +79,7 @@ public class AppWindowTokenTests extends WindowTestsBase {
		@Test
		public void testFindMainWindow() throws Exception {
		final WindowTestUtils.TestAppWindowToken token =
		new WindowTestUtils.TestAppWindowToken(sDisplayContent);
		new WindowTestUtils.TestAppWindowToken(mDisplayContent);

		assertNull(token.findMainWindow());

		@@ -102,10 +101,10 @@ public class AppWindowTokenTests extends WindowTestsBase {
		sWm.mDisplayEnabled = true;

		// Create an app window with token on a display.
		final TaskStack stack = createTaskStackOnDisplay(sDisplayContent);
		final TaskStack stack = createTaskStackOnDisplay(mDisplayContent);
		final Task task = createTaskInStack(stack, 0 /* userId */);
		final WindowTestUtils.TestAppWindowToken appWindowToken =
		new WindowTestUtils.TestAppWindowToken(sDisplayContent);
		new WindowTestUtils.TestAppWindowToken(mDisplayContent);
		task.addChild(appWindowToken, 0);
		final WindowManager.LayoutParams attrs = new WindowManager.LayoutParams(
		TYPE_BASE_APPLICATION);
		@@ -115,17 +114,17 @@ public class AppWindowTokenTests extends WindowTestsBase {

		// Set initial orientation and update.
		appWindowToken.setOrientation(SCREEN_ORIENTATION_LANDSCAPE);
		sWm.updateOrientationFromAppTokens(sDisplayContent.getOverrideConfiguration(), null,
		sDisplayContent.getDisplayId());
		assertEquals(SCREEN_ORIENTATION_LANDSCAPE, sDisplayContent.getLastOrientation());
		sWm.updateOrientationFromAppTokens(mDisplayContent.getOverrideConfiguration(), null,
		mDisplayContent.getDisplayId());
		assertEquals(SCREEN_ORIENTATION_LANDSCAPE, mDisplayContent.getLastOrientation());
		appWindow.resizeReported = false;

		// Update the orientation to perform 180 degree rotation and check that resize was reported.
		appWindowToken.setOrientation(SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
		sWm.updateOrientationFromAppTokens(sDisplayContent.getOverrideConfiguration(), null,
		sDisplayContent.getDisplayId());
		sWm.updateOrientationFromAppTokens(mDisplayContent.getOverrideConfiguration(), null,
		mDisplayContent.getDisplayId());
		sWm.mRoot.performSurfacePlacement(false /* recoveringMemory */);
		assertEquals(SCREEN_ORIENTATION_REVERSE_LANDSCAPE, sDisplayContent.getLastOrientation());
		assertEquals(SCREEN_ORIENTATION_REVERSE_LANDSCAPE, mDisplayContent.getLastOrientation());
		assertTrue(appWindow.resizeReported);
		appWindow.removeImmediately();
		}
		@@ -170,7 +169,7 @@ public class AppWindowTokenTests extends WindowTestsBase {
		@Test
		public void testGetOrientation() throws Exception {
		final WindowTestUtils.TestAppWindowToken token =
		new WindowTestUtils.TestAppWindowToken(sDisplayContent);
		new WindowTestUtils.TestAppWindowToken(mDisplayContent);
		token.setOrientation(SCREEN_ORIENTATION_LANDSCAPE);

		token.setFillsParent(false);

services/tests/servicestests/src/com/android/server/wm/DisplayContentTests.java

+81 −81

Original line number	Diff line number	Diff line
		@@ -52,74 +52,74 @@ public class DisplayContentTests extends WindowTestsBase {
		@Test
		public void testForAllWindows() throws Exception {
		final WindowState exitingAppWindow = createWindow(null, TYPE_BASE_APPLICATION,
		sDisplayContent, "exiting app");
		mDisplayContent, "exiting app");
		final AppWindowToken exitingAppToken = exitingAppWindow.mAppToken;
		exitingAppToken.mIsExiting = true;
		exitingAppToken.getTask().mStack.mExitingAppTokens.add(exitingAppToken);

		assertForAllWindowsOrder(Arrays.asList(
		sWallpaperWindow,
		mWallpaperWindow,
		exitingAppWindow,
		sChildAppWindowBelow,
		sAppWindow,
		sChildAppWindowAbove,
		sDockedDividerWindow,
		sStatusBarWindow,
		sNavBarWindow,
		sImeWindow,
		sImeDialogWindow));
		mChildAppWindowBelow,
		mAppWindow,
		mChildAppWindowAbove,
		mDockedDividerWindow,
		mStatusBarWindow,
		mNavBarWindow,
		mImeWindow,
		mImeDialogWindow));
		}

		@Test
		public void testForAllWindows_WithAppImeTarget() throws Exception {
		final WindowState imeAppTarget =
		createWindow(null, TYPE_BASE_APPLICATION, sDisplayContent, "imeAppTarget");
		createWindow(null, TYPE_BASE_APPLICATION, mDisplayContent, "imeAppTarget");

		sWm.mInputMethodTarget = imeAppTarget;

		assertForAllWindowsOrder(Arrays.asList(
		sWallpaperWindow,
		sChildAppWindowBelow,
		sAppWindow,
		sChildAppWindowAbove,
		mWallpaperWindow,
		mChildAppWindowBelow,
		mAppWindow,
		mChildAppWindowAbove,
		imeAppTarget,
		sImeWindow,
		sImeDialogWindow,
		sDockedDividerWindow,
		sStatusBarWindow,
		sNavBarWindow));
		mImeWindow,
		mImeDialogWindow,
		mDockedDividerWindow,
		mStatusBarWindow,
		mNavBarWindow));
		}

		@Test
		public void testForAllWindows_WithChildWindowImeTarget() throws Exception {
		sWm.mInputMethodTarget = sChildAppWindowAbove;
		sWm.mInputMethodTarget = mChildAppWindowAbove;

		assertForAllWindowsOrder(Arrays.asList(
		sWallpaperWindow,
		sChildAppWindowBelow,
		sAppWindow,
		sChildAppWindowAbove,
		sImeWindow,
		sImeDialogWindow,
		sDockedDividerWindow,
		sStatusBarWindow,
		sNavBarWindow));
		mWallpaperWindow,
		mChildAppWindowBelow,
		mAppWindow,
		mChildAppWindowAbove,
		mImeWindow,
		mImeDialogWindow,
		mDockedDividerWindow,
		mStatusBarWindow,
		mNavBarWindow));
		}

		@Test
		public void testForAllWindows_WithStatusBarImeTarget() throws Exception {
		sWm.mInputMethodTarget = sStatusBarWindow;
		sWm.mInputMethodTarget = mStatusBarWindow;

		assertForAllWindowsOrder(Arrays.asList(
		sWallpaperWindow,
		sChildAppWindowBelow,
		sAppWindow,
		sChildAppWindowAbove,
		sDockedDividerWindow,
		sStatusBarWindow,
		sImeWindow,
		sImeDialogWindow,
		sNavBarWindow));
		mWallpaperWindow,
		mChildAppWindowBelow,
		mAppWindow,
		mChildAppWindowAbove,
		mDockedDividerWindow,
		mStatusBarWindow,
		mImeWindow,
		mImeDialogWindow,
		mNavBarWindow));
		}

		@Test
		@@ -127,28 +127,28 @@ public class DisplayContentTests extends WindowTestsBase {
		// This window is set-up to be z-ordered between some windows that go in the same token like
		// the nav bar and status bar.
		final WindowState voiceInteractionWindow = createWindow(null, TYPE_VOICE_INTERACTION,
		sDisplayContent, "voiceInteractionWindow");
		mDisplayContent, "voiceInteractionWindow");

		assertForAllWindowsOrder(Arrays.asList(
		sWallpaperWindow,
		sChildAppWindowBelow,
		sAppWindow,
		sChildAppWindowAbove,
		sDockedDividerWindow,
		mWallpaperWindow,
		mChildAppWindowBelow,
		mAppWindow,
		mChildAppWindowAbove,
		mDockedDividerWindow,
		voiceInteractionWindow,
		sStatusBarWindow,
		sNavBarWindow,
		sImeWindow,
		sImeDialogWindow));
		mStatusBarWindow,
		mNavBarWindow,
		mImeWindow,
		mImeDialogWindow));
		}

		@Test
		public void testComputeImeTarget() throws Exception {
		// Verify that an app window can be an ime target.
		final WindowState appWin = createWindow(null, TYPE_APPLICATION, sDisplayContent, "appWin");
		final WindowState appWin = createWindow(null, TYPE_APPLICATION, mDisplayContent, "appWin");
		appWin.setHasSurface(true);
		assertTrue(appWin.canBeImeTarget());
		WindowState imeTarget = sDisplayContent.computeImeTarget(false /* updateImeTarget */);
		WindowState imeTarget = mDisplayContent.computeImeTarget(false /* updateImeTarget */);
		assertEquals(appWin, imeTarget);

		// Verify that an child window can be an ime target.
		@@ -156,7 +156,7 @@ public class DisplayContentTests extends WindowTestsBase {
		TYPE_APPLICATION_ATTACHED_DIALOG, "childWin");
		childWin.setHasSurface(true);
		assertTrue(childWin.canBeImeTarget());
		imeTarget = sDisplayContent.computeImeTarget(false /* updateImeTarget */);
		imeTarget = mDisplayContent.computeImeTarget(false /* updateImeTarget */);
		assertEquals(childWin, imeTarget);
		}

		@@ -182,12 +182,12 @@ public class DisplayContentTests extends WindowTestsBase {
		assertEquals(dc, token.getDisplayContent());

		// Move stack to first display.
		sDisplayContent.moveStackToDisplay(stack, true /* onTop */);
		assertEquals(sDisplayContent.getDisplayId(), stack.getDisplayContent().getDisplayId());
		assertEquals(sDisplayContent, stack.getParent().getParent());
		assertEquals(sDisplayContent, stack.getDisplayContent());
		assertEquals(sDisplayContent, task.getDisplayContent());
		assertEquals(sDisplayContent, token.getDisplayContent());
		mDisplayContent.moveStackToDisplay(stack, true /* onTop */);
		assertEquals(mDisplayContent.getDisplayId(), stack.getDisplayContent().getDisplayId());
		assertEquals(mDisplayContent, stack.getParent().getParent());
		assertEquals(mDisplayContent, stack.getDisplayContent());
		assertEquals(mDisplayContent, task.getDisplayContent());
		assertEquals(mDisplayContent, token.getDisplayContent());
		}

		/**
		@@ -195,8 +195,8 @@ public class DisplayContentTests extends WindowTestsBase {
		*/
		@Test
		public void testDisplayOverrideConfigUpdate() throws Exception {
		final int displayId = sDisplayContent.getDisplayId();
		final Configuration currentOverrideConfig = sDisplayContent.getOverrideConfiguration();
		final int displayId = mDisplayContent.getDisplayId();
		final Configuration currentOverrideConfig = mDisplayContent.getOverrideConfiguration();

		// Create new, slightly changed override configuration and apply it to the display.
		final Configuration newOverrideConfig = new Configuration(currentOverrideConfig);
		@@ -206,7 +206,7 @@ public class DisplayContentTests extends WindowTestsBase {
		sWm.setNewDisplayOverrideConfiguration(newOverrideConfig, displayId);

		// Check that override config is applied.
		assertEquals(newOverrideConfig, sDisplayContent.getOverrideConfiguration());
		assertEquals(newOverrideConfig, mDisplayContent.getOverrideConfiguration());
		}

		/**
		@@ -214,7 +214,7 @@ public class DisplayContentTests extends WindowTestsBase {
		*/
		@Test
		public void testDefaultDisplayOverrideConfigUpdate() throws Exception {
		final Configuration currentConfig = sDisplayContent.getConfiguration();
		final Configuration currentConfig = mDisplayContent.getConfiguration();

		// Create new, slightly changed override configuration and apply it to the display.
		final Configuration newOverrideConfig = new Configuration(currentConfig);
		@@ -239,7 +239,7 @@ public class DisplayContentTests extends WindowTestsBase {
		public void testFocusedWindowMultipleDisplays() throws Exception {
		// Create a focusable window and check that focus is calcualted correctly
		final WindowState window1 =
		createWindow(null, TYPE_BASE_APPLICATION, sDisplayContent, "window1");
		createWindow(null, TYPE_BASE_APPLICATION, mDisplayContent, "window1");
		assertEquals(window1, sWm.mRoot.computeFocusedWindow());

		// Check that a new display doesn't affect focus
		@@ -264,30 +264,30 @@ public class DisplayContentTests extends WindowTestsBase {
		final int baseHeight = 2560;
		final int baseDensity = 300;

		sDisplayContent.updateBaseDisplayMetrics(baseWidth, baseHeight, baseDensity);
		mDisplayContent.updateBaseDisplayMetrics(baseWidth, baseHeight, baseDensity);

		final int maxWidth = 300;
		final int resultingHeight = (maxWidth * baseHeight) / baseWidth;
		final int resultingDensity = (maxWidth * baseDensity) / baseWidth;

		sDisplayContent.setMaxUiWidth(maxWidth);
		verifySizes(sDisplayContent, maxWidth, resultingHeight, resultingDensity);
		mDisplayContent.setMaxUiWidth(maxWidth);
		verifySizes(mDisplayContent, maxWidth, resultingHeight, resultingDensity);

		// Assert setting values again does not change;
		sDisplayContent.updateBaseDisplayMetrics(baseWidth, baseHeight, baseDensity);
		verifySizes(sDisplayContent, maxWidth, resultingHeight, resultingDensity);
		mDisplayContent.updateBaseDisplayMetrics(baseWidth, baseHeight, baseDensity);
		verifySizes(mDisplayContent, maxWidth, resultingHeight, resultingDensity);

		final int smallerWidth = 200;
		final int smallerHeight = 400;
		final int smallerDensity = 100;

		// Specify smaller dimension, verify that it is honored
		sDisplayContent.updateBaseDisplayMetrics(smallerWidth, smallerHeight, smallerDensity);
		verifySizes(sDisplayContent, smallerWidth, smallerHeight, smallerDensity);
		mDisplayContent.updateBaseDisplayMetrics(smallerWidth, smallerHeight, smallerDensity);
		verifySizes(mDisplayContent, smallerWidth, smallerHeight, smallerDensity);

		// Verify that setting the max width to a greater value than the base width has no effect
		sDisplayContent.setMaxUiWidth(maxWidth);
		verifySizes(sDisplayContent, smallerWidth, smallerHeight, smallerDensity);
		mDisplayContent.setMaxUiWidth(maxWidth);
		verifySizes(mDisplayContent, smallerWidth, smallerHeight, smallerDensity);
		}

		/**
		@@ -295,17 +295,17 @@ public class DisplayContentTests extends WindowTestsBase {
		*/
		@Test
		public void testPinnedStackLocation() {
		createStackControllerOnStackOnDisplay(PINNED_STACK_ID, sDisplayContent);
		final int initialStackCount = sDisplayContent.getStackCount();
		createStackControllerOnStackOnDisplay(PINNED_STACK_ID, mDisplayContent);
		final int initialStackCount = mDisplayContent.getStackCount();
		// Ensure that the pinned stack was placed at the end
		assertEquals(initialStackCount - 1, sDisplayContent.getStaskPosById(PINNED_STACK_ID));
		assertEquals(initialStackCount - 1, mDisplayContent.getStaskPosById(PINNED_STACK_ID));
		// By default, this should try to create a new stack on top
		createTaskStackOnDisplay(sDisplayContent);
		final int afterStackCount = sDisplayContent.getStackCount();
		createTaskStackOnDisplay(mDisplayContent);
		final int afterStackCount = mDisplayContent.getStackCount();
		// Make sure the stack count has increased
		assertEquals(initialStackCount + 1, afterStackCount);
		// Ensure that the pinned stack is still on top
		assertEquals(afterStackCount - 1, sDisplayContent.getStaskPosById(PINNED_STACK_ID));
		assertEquals(afterStackCount - 1, mDisplayContent.getStaskPosById(PINNED_STACK_ID));
		}

		private static void verifySizes(DisplayContent displayContent, int expectedBaseWidth,
		@@ -319,7 +319,7 @@ public class DisplayContentTests extends WindowTestsBase {
		final LinkedList<WindowState> actualWindows = new LinkedList();

		// Test forward traversal.
		sDisplayContent.forAllWindows(actualWindows::addLast, false /* traverseTopToBottom */);
		mDisplayContent.forAllWindows(actualWindows::addLast, false /* traverseTopToBottom */);
		assertEquals(expectedWindows.size(), actualWindows.size());
		for (WindowState w : expectedWindows) {
		assertEquals(w, actualWindows.pollFirst());
		@@ -327,7 +327,7 @@ public class DisplayContentTests extends WindowTestsBase {
		assertTrue(actualWindows.isEmpty());

		// Test backward traversal.
		sDisplayContent.forAllWindows(actualWindows::addLast, true /* traverseTopToBottom */);
		mDisplayContent.forAllWindows(actualWindows::addLast, true /* traverseTopToBottom */);
		assertEquals(expectedWindows.size(), actualWindows.size());
		for (WindowState w : expectedWindows) {
		assertEquals(w, actualWindows.pollLast());