@TestOnly
 public synchronized void checkCleared() {
   try {
     assert myStartupActivities.isEmpty() : "Activities: " + myStartupActivities;
     assert myDumbAwarePostStartupActivities.isEmpty()
         : "DumbAware Post Activities: " + myDumbAwarePostStartupActivities;
     assert myNotDumbAwarePostStartupActivities.isEmpty()
         : "Post Activities: " + myNotDumbAwarePostStartupActivities;
     assert myPreStartupActivities.isEmpty() : "Pre Activities: " + myPreStartupActivities;
   } finally {
     prepareForNextTest();
   }
 }