  @Test
  public void testSampleActor()
  {

    new JavaTestKit(system) {{
      final ActorRef subject = system.actorOf(Props.create(SampleActor.class), "sample-actor");
      final ActorRef probeRef = getRef();

      subject.tell(47.11, probeRef);
      subject.tell("and no guard in the beginning", probeRef);
      subject.tell("guard is a good thing", probeRef);
      subject.tell(47.11, probeRef);
      subject.tell(4711, probeRef);
      subject.tell("and no guard in the beginning", probeRef);
      subject.tell(4711, probeRef);
      subject.tell("and an unmatched message", probeRef);

      expectMsgEquals(47.11);
      assertTrue(expectMsgClass(String.class).startsWith("startsWith(guard):"));
      assertTrue(expectMsgClass(String.class).startsWith("contains(guard):"));
      expectMsgEquals(47110);
      expectNoMsg();
    }};
  }