Verifying that test initialization switched to workspace

Change-Id: I4d33f831a6fbb6632dc21d056fb239d9d1dcddd8
diff --git a/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java b/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
index dfb0edf..5ab8d05 100644
--- a/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
+++ b/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
@@ -119,6 +119,8 @@
         test.waitForLauncherCondition("Launcher didn't start", launcher -> launcher != null);
         test.waitForState("Launcher internal state didn't switch to Home", LauncherState.NORMAL);
         test.waitForResumed("Launcher internal state is still Background");
+        // Check that we switched to home.
+        test.mLauncher.getWorkspace();
     }
 
     // Please don't add negative test cases for methods that fail only after a long wait.