private boolean checkInterest(IInteractionContext activeContext, String id) {
   boolean found = false;
   for (IInteractionElement elem : activeContext.getAllElements()) {
     assertEquals(elem.getContentType(), "ecore"); // $NON-NLS-1$
     if (elem.getHandleIdentifier().equals(id)) {
       found = true;
     }
     assertTrue(elem.getInterest().isInteresting());
   }
   return found;
 }