diff --git a/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java b/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java
index 4895b10..437a19b 100644
--- a/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java
+++ b/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java
@@ -31,6 +31,7 @@
 
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
+import com.android.launcher3.tapl.AllApps;
 import com.android.launcher3.tapl.Background;
 import com.android.launcher3.tapl.LauncherInstrumentation.NavigationModel;
 import com.android.launcher3.tapl.Overview;
@@ -49,6 +50,9 @@
 @LargeTest
 @RunWith(AndroidJUnit4.class)
 public class TaplTestsQuickstep extends AbstractQuickStepTest {
+
+    private static final String APP_NAME = "LauncherTestApp";
+
     @Before
     public void setUp() throws Exception {
         super.setUp();
@@ -286,6 +290,30 @@
         getAndAssertBackground();
     }
 
+    // TODO(b/204830798): test with all navigation modes(add @NavigationModeSwitch annotation)
+    //  after the bug resolved.
+    @Test
+    @PortraitLandscape
+    @ScreenRecord
+    public void testPressBack() throws Exception {
+        mLauncher.getWorkspace().switchToAllApps();
+        mLauncher.pressBack();
+        mLauncher.getWorkspace();
+        waitForState("Launcher internal state didn't switch to Home", () -> LauncherState.NORMAL);
+
+        AllApps allApps = mLauncher.getWorkspace().switchToAllApps();
+        allApps.freeze();
+        try {
+            allApps.getAppIcon(APP_NAME).dragToWorkspace(false, false);
+        } finally {
+            allApps.unfreeze();
+        }
+        mLauncher.getWorkspace().getWorkspaceAppIcon(APP_NAME).launch(getAppPackageName());
+        mLauncher.pressBack();
+        mLauncher.getWorkspace();
+        waitForState("Launcher internal state didn't switch to Home", () -> LauncherState.NORMAL);
+    }
+
     @Test
     @PortraitLandscape
     public void testOverviewForTablet() throws Exception {
diff --git a/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java b/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
index 0ffbeeb..82163cb 100644
--- a/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
+++ b/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
@@ -211,7 +211,8 @@
     }
 
     protected TestRule getRulesInsideActivityMonitor() {
-        final RuleChain inner = RuleChain.outerRule(new PortraitLandscapeRunner(this))
+        final RuleChain inner = RuleChain
+                .outerRule(new PortraitLandscapeRunner(this))
                 .around(new FailureWatcher(mDevice, mLauncher));
 
         return TestHelpers.isInLauncherProcess()
diff --git a/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java b/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
index 2fa84b2..4007c26 100644
--- a/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
+++ b/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
@@ -413,6 +413,27 @@
         folder.close();
     }
 
+    @Test
+    @PortraitLandscape
+    public void testPressBack() throws Exception {
+        mLauncher.getWorkspace().switchToAllApps();
+        mLauncher.pressBack();
+        mLauncher.getWorkspace();
+        waitForState("Launcher internal state didn't switch to Home", () -> LauncherState.NORMAL);
+
+        AllApps allApps = mLauncher.getWorkspace().switchToAllApps();
+        allApps.freeze();
+        try {
+            allApps.getAppIcon(APP_NAME).dragToWorkspace(false, false);
+        } finally {
+            allApps.unfreeze();
+        }
+        mLauncher.getWorkspace().getWorkspaceAppIcon(APP_NAME).launch(getAppPackageName());
+        mLauncher.pressBack();
+        mLauncher.getWorkspace();
+        waitForState("Launcher internal state didn't switch to Home", () -> LauncherState.NORMAL);
+    }
+
     public static String getAppPackageName() {
         return getInstrumentation().getContext().getPackageName();
     }
diff --git a/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java b/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
index 3ac5fa5..e2d0238 100644
--- a/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
+++ b/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
@@ -76,6 +76,7 @@
 import java.io.IOException;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Deque;
@@ -110,6 +111,9 @@
     static final Pattern EVENT_TOUCH_DOWN_TIS = getTouchEventPatternTIS("ACTION_DOWN");
     static final Pattern EVENT_TOUCH_UP_TIS = getTouchEventPatternTIS("ACTION_UP");
 
+    static final Pattern EVENT_KEY_BACK_DOWN = getKeyEventPattern("ACTION_DOWN", "KEYCODE_BACK");
+    static final Pattern EVENT_KEY_BACK_UP = getKeyEventPattern("ACTION_UP", "KEYCODE_BACK");
+
     private final String mLauncherPackage;
     private Boolean mIsLauncher3;
     private long mTestStartTime = -1;
@@ -125,7 +129,8 @@
     // Where the gesture happens: outside of Launcher, inside or from inside to outside and
     // whether the gesture recognition triggers pilfer.
     public enum GestureScope {
-        OUTSIDE_WITHOUT_PILFER, OUTSIDE_WITH_PILFER, INSIDE, INSIDE_TO_OUTSIDE
+        OUTSIDE_WITHOUT_PILFER, OUTSIDE_WITH_PILFER, INSIDE, INSIDE_TO_OUTSIDE,
+        INSIDE_TO_OUTSIDE_WITHOUT_PILFER,
     }
 
     // Base class for launcher containers.
@@ -195,6 +200,10 @@
         return getTouchEventPattern("TouchInteractionService.onInputEvent", action);
     }
 
+    private static Pattern getKeyEventPattern(String action, String keyCode) {
+        return Pattern.compile("Key event: KeyEvent.*action=" + action + ".*keyCode=" + keyCode);
+    }
+
     /**
      * Constructs the root of TAPL hierarchy. You get all other objects from it.
      */
@@ -879,6 +888,38 @@
         }
     }
 
+    /**
+     * Press navbar back button or swipe back if in gesture navigation mode.
+     */
+    public void pressBack() {
+        try (Closable e = eventsCheck(); Closable c = addContextLayer("want to press back")) {
+            waitForLauncherInitialized();
+            final boolean launcherVisible =
+                    isTablet() ? isLauncherContainerVisible() : isLauncherVisible();
+            if (getNavigationModel() == NavigationModel.ZERO_BUTTON) {
+                final Point displaySize = getRealDisplaySize();
+                final GestureScope gestureScope =
+                        launcherVisible ? GestureScope.INSIDE_TO_OUTSIDE_WITHOUT_PILFER
+                                : GestureScope.OUTSIDE_WITHOUT_PILFER;
+                linearGesture(0, displaySize.y / 2, displaySize.x / 2, displaySize.y / 2,
+                        10, false, gestureScope);
+            } else {
+                waitForNavigationUiObject("back").click();
+                if (isTablet()) {
+                    expectEvent(TestProtocol.SEQUENCE_MAIN, EVENT_TOUCH_DOWN);
+                    expectEvent(TestProtocol.SEQUENCE_MAIN, EVENT_TOUCH_UP);
+                } else if (!isLauncher3() && getNavigationModel() == NavigationModel.TWO_BUTTON) {
+                    expectEvent(TestProtocol.SEQUENCE_TIS, EVENT_TOUCH_DOWN_TIS);
+                    expectEvent(TestProtocol.SEQUENCE_TIS, EVENT_TOUCH_UP_TIS);
+                }
+            }
+            if (launcherVisible) {
+                expectEvent(TestProtocol.SEQUENCE_MAIN, EVENT_KEY_BACK_DOWN);
+                expectEvent(TestProtocol.SEQUENCE_MAIN, EVENT_KEY_BACK_UP);
+            }
+        }
+    }
+
     private static BySelector getAnyObjectSelector() {
         return By.textStartsWith("");
     }
@@ -888,6 +929,11 @@
         return hasLauncherObject(getAnyObjectSelector());
     }
 
+    boolean isLauncherContainerVisible() {
+        final String[] containerResources = {WORKSPACE_RES_ID, OVERVIEW_RES_ID, APPS_RES_ID};
+        return Arrays.stream(containerResources).anyMatch(r -> hasLauncherObject(r));
+    }
+
     /**
      * Gets the Workspace object if the current state is "active home", i.e. workspace. Fails if the
      * launcher is not in that state.
@@ -1414,6 +1460,7 @@
                 break;
             case MotionEvent.ACTION_UP:
                 if (notLauncher3 && gestureScope != GestureScope.INSIDE
+                        && gestureScope != GestureScope.INSIDE_TO_OUTSIDE_WITHOUT_PILFER
                         && (gestureScope == GestureScope.OUTSIDE_WITH_PILFER
                         || gestureScope == GestureScope.INSIDE_TO_OUTSIDE)) {
                     expectEvent(TestProtocol.SEQUENCE_PILFER, EVENT_PILFER_POINTERS);