public void notASubscriber(Object o) {
      nonSubscriberEvents.add(o);
    }

    @Subscribe
    public void subscriber(Object o) {
      subscriberEvents.add(o);
    }
  }

  public void testNonSubscriber() {
    assertThat(getSubscriber().nonSubscriberEvents).isEmpty();
  }

  public void testSubscriber() {
    assertThat(getSubscriber().subscriberEvents).contains(EVENT);
  }

  @Override