Add tests to Launcher P0 CUJ Homescreen navigation via TAPL. am: 30c3552e7e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/19773679

Change-Id: Ic6c93ba67f635f6523487848665569e67d83c990
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java

@@ -214,9 +214,9 @@ public class TaplTestsLauncher3 extends AbstractLauncherUiTest {
         // Test that ensureWorkspaceIsScrollable adds a page by dragging an icon there.
         executeOnLauncher(launcher -> assertFalse("Initial workspace state is scrollable",
                 isWorkspaceScrollable(launcher)));
-        workspace.verifyWorkspaceAppIconIsGone(
-                "Chrome app was found on empty workspace", "Chrome");
-
+        assertEquals("Initial workspace doesn't have the correct page", workspace.pagesPerScreen(),
+                workspace.getPageCount());
+        workspace.verifyWorkspaceAppIconIsGone("Chrome app was found on empty workspace", "Chrome");
         workspace.ensureWorkspaceIsScrollable();
 
         executeOnLauncher(

tests/tapl/com/android/launcher3/tapl/Workspace.java

@@ -192,6 +192,12 @@ public final class Workspace extends Home {
         }
     }
 
+    /** Returns the number of pages. */
+    public int getPageCount() {
+        final UiObject2 workspace = verifyActiveContainer();
+        return workspace.getChildCount();
+    }
+
     /**
      * Returns the number of pages that are visible on the screen simultaneously.
      */