[StartSurface] Add tap on MV tiles integration tests

Bug: 1051226
Change-Id: Ieee0fcb41ff6f3d1282b709cffd23ed381102687
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050754Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742804}

chrome/android/features/start_surface/internal/javatests/src/org/chromium/chrome/features/start_surface/StartSurfaceTest.java

@@ -277,6 +277,54 @@ public class StartSurfaceTest {
                 equalTo(1));
     }
 
+    @Test
+    @MediumTest
+    @Feature({"StartSurface"})
+    @CommandLineFlags.Add({BASE_PARAMS + "/single"})
+    public void testTapMVTilesInSingleSurface() {
+        // TODO(crbug.com/1025296): Set cached flag before starting the activity and mimic clicking
+        // the 'home' button to show the single start surface home page.
+        TestThreadUtils.runOnUiThreadBlocking(
+                ()
+                        -> mActivityTestRule.getActivity()
+                                   .getStartSurface()
+                                   .getController()
+                                   .setOverviewState(OverviewModeState.SHOWING_HOMEPAGE));
+        TestThreadUtils.runOnUiThreadBlocking(
+                () -> mActivityTestRule.getActivity().getLayoutManager().showOverview(false));
+        assertThat(
+                mActivityTestRule.getActivity().getTabModelSelector().getCurrentModel().getCount(),
+                equalTo(1));
+
+        ViewGroup mvTilesContainer = (ViewGroup) mActivityTestRule.getActivity().findViewById(
+                org.chromium.chrome.tab_ui.R.id.mv_tiles_layout);
+        assertTrue(mvTilesContainer.getChildCount() > 0);
+
+        OverviewModeBehaviorWatcher hideWatcher =
+                TabUiTestHelper.createOverviewHideWatcher(mActivityTestRule.getActivity());
+        try {
+            // TODO (crbug.com/1025296): Find a way to perform click on a child at index 0 in
+            // LinearLayout with Espresso. Note that we do not have 'withParentIndex' so far.
+            TestThreadUtils.runOnUiThreadBlocking(
+                    () -> mvTilesContainer.getChildAt(0).performClick());
+        } catch (ExecutionException e) {
+            assertTrue(false);
+        }
+        hideWatcher.waitForBehavior();
+        assertThat(
+                mActivityTestRule.getActivity().getTabModelSelector().getCurrentModel().getCount(),
+                equalTo(2));
+
+        // Press back button should close the tab opened from the Start surface.
+        OverviewModeBehaviorWatcher showWatcher =
+                TabUiTestHelper.createOverviewShowWatcher(mActivityTestRule.getActivity());
+        pressBack();
+        showWatcher.waitForBehavior();
+        assertThat(
+                mActivityTestRule.getActivity().getTabModelSelector().getCurrentModel().getCount(),
+                equalTo(1));
+    }
+
     @Test
     @MediumTest
     @Feature({"StartSurface"})

chrome/android/features/tab_ui/javatests/src/org/chromium/chrome/browser/tasks/tab_management/TabUiTestHelper.java

@@ -328,7 +328,7 @@ public class TabUiTestHelper {
     /**
      * Create a {@link OverviewModeBehaviorWatcher} to inspect overview show.
      */
-    static OverviewModeBehaviorWatcher createOverviewShowWatcher(ChromeTabbedActivity cta) {
+    public static OverviewModeBehaviorWatcher createOverviewShowWatcher(ChromeTabbedActivity cta) {
         return new OverviewModeBehaviorWatcher(cta.getLayoutManager(), true, false);
     }