@Test
  public void testSubscribe() {
    testSubject.subscribe();

    verify(mockBus).subscribe(Long.class, testSubject);
    verify(mockBus).subscribe(String.class, testSubject);
    verify(mockBus).subscribe(HashSet.class, testSubject);
    verify(mockBus).subscribe(ArrayList.class, testSubject);
    verifyNoMoreInteractions(mockBus);
  }