ActorRefImpl implements ActorRef<T> { @NonNull public T tell() { return mInstance; } ActorRefImpl(@NonNull T instance); @NonNull T tell();  }
@Test public void referenceTest() { Long item = 12000000L; ActorRefImpl<Long> ref = new ActorRefImpl<>(item); Assert.assertSame(item, ref.tell()); Assert.assertSame(item, ref.tell()); }