@Test
public void testHandleDittoRuntimeException() {

    new TestKit(actorSystem) {{
        final TestProbe targetActor = new TestProbe(actorSystem);
        targetActor.setAutoPilot(new AutoPilotAnsweringWithException(DITTO_RUNTIME_EXCEPTION));
        final Props props = ThingsAggregatorProxyActor.props(targetActor.ref());
        final ActorRef proxyActor = actorSystem.actorOf(props);
        proxyActor.tell(RETRIEVE_THINGS_COMMAND, getRef());
        expectMsg(DITTO_RUNTIME_EXCEPTION);
    }};
}