public void ActorSubscriberSpec_should_not_deliver_more_after_cancel()
{
var actorRef = Source.From(Enumerable.Range(1, 5))
.RunWith(Sink.ActorSubscriber<int>(ManualSubscriber.Props(TestActor)), Sys.Materializer());
actorRef.Tell("ready");
ExpectMsg<OnNext>().Element.Should().Be(1);
ExpectMsg<OnNext>().Element.Should().Be(2);
actorRef.Tell("requestAndCancel");
ExpectNoMsg(200);
}