@Test
public void sendingServeCoffeeShouldResultInApproveCoffeeToCoffeeHouse() {

    new JavaTestKit(system) {{
        ActorRef coffeeHouse = getRef();
        TestProbe guest = new TestProbe(system);
        ActorRef waiter = system.actorOf(Waiter.props(coffeeHouse));
        waiter.tell(new Waiter.ServeCoffee(new Coffee.Akkaccino()), guest.ref());
        expectMsgEquals(new CoffeeHouse.ApproveCoffee(new Coffee.Akkaccino(), guest.ref()));
    }};
}