assertEquals(1, Iterators.size(registry.getSubscribers(1)));

    registry.register(new IntegerSubscriber());
    assertEquals(3, Iterators.size(registry.getSubscribers("")));
    assertEquals(1, Iterators.size(registry.getSubscribers(new Object())));
    assertEquals(2, Iterators.size(registry.getSubscribers(1)));
  }

  public void testGetSubscribers_returnsImmutableSnapshot() {

    assertEquals(1, Iterators.size(registry.getSubscribers(1)));

    registry.register(new IntegerSubscriber());
    assertEquals(3, Iterators.size(registry.getSubscribers("")));
    assertEquals(1, Iterators.size(registry.getSubscribers(new Object())));
    assertEquals(2, Iterators.size(registry.getSubscribers(1)));
  }

  public void testGetSubscribers_returnsImmutableSnapshot() {

  }

  /**
   * Gets an iterator representing an immutable snapshot of all subscribers to the given event at
   * the time this method is called.
   */
  Iterator<Subscriber> getSubscribers(Object event) {
    ImmutableSet<Class<?>> eventTypes = flattenHierarchy(event.getClass());

    List<Iterator<Subscriber>> subscriberIterators =
        Lists.newArrayListWithCapacity(eventTypes.size());

   * already a {@link DeadEvent}, it will be wrapped in a DeadEvent and reposted.
   *
   * @param event event to post.
   */
  public void post(Object event) {
    Iterator<Subscriber> eventSubscribers = subscribers.getSubscribers(event);
    if (eventSubscribers.hasNext()) {
      dispatcher.dispatch(event, eventSubscribers);
    } else if (!(event instanceof DeadEvent)) {
      // the event had no subscribers and was not itself a DeadEvent

  }

  public void testDeclaredIn1AnnotatedIn2() {
    assertThat(getSubscriber().declaredIn1AnnotatedIn2Events).contains(EVENT);
  }

  public void testDeclaredIn1AnnotatedInClass() {
    assertThat(getSubscriber().declaredIn1AnnotatedInClassEvents).contains(EVENT);
  }

  public void testDeclaredIn2AnnotatedInClass() {

  }

  public void testDeclaredIn1AnnotatedIn2() {
    assertThat(getSubscriber().declaredIn1AnnotatedIn2Events).contains(EVENT);
  }

  public void testDeclaredIn1AnnotatedInClass() {
    assertThat(getSubscriber().declaredIn1AnnotatedInClassEvents).contains(EVENT);
  }

  public void testDeclaredIn2AnnotatedInClass() {

  }

  public void testNotOverriddenInSubclass() {
    assertThat(getSubscriber().notOverriddenInSubclassEvents).contains(EVENT);
  }

  public void testOverriddenNotAnnotatedInSubclass() {
    assertThat(getSubscriber().overriddenNotAnnotatedInSubclassEvents).contains(EVENT);
  }

  public void testDifferentlyOverriddenNotAnnotatedInSubclass() {
    assertThat(getSubscriber().differentlyOverriddenNotAnnotatedInSubclassGoodEvents)

    @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
  Subscriber createSubscriber() {
    return new Subscriber();
  }

  }

  public void testNotOverriddenInSubclass() {
    assertThat(getSubscriber().notOverriddenInSubclassEvents).contains(EVENT);
  }

  public void testOverriddenNotAnnotatedInSubclass() {
    assertThat(getSubscriber().overriddenNotAnnotatedInSubclassEvents).contains(EVENT);
  }

  public void testDifferentlyOverriddenNotAnnotatedInSubclass() {
    assertThat(getSubscriber().differentlyOverriddenNotAnnotatedInSubclassGoodEvents)

    @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
  Subscriber createSubscriber() {
    return new Subscriber();
  }