public void SqsAckFlow_default_stream_should_react_on_Ignore_commands() { var publisher = this.CreatePublisherProbe <MessageAction>(); var subscriber = this.CreateSubscriberProbe <ISqsAckResult>(); Source.FromPublisher(publisher) .Via(SqsAckFlow.Default(client, TestQueueUrl, SqsAckSettings.Default.WithMaxInFlight(1))) .To(Sink.FromSubscriber(subscriber)) .Run(materializer); subscriber.Request(3); publisher.SendNext(MessageAction.Ignore(Message("a-1"))); publisher.SendNext(MessageAction.Ignore(Message("a-2"))); subscriber.ExpectNext <ISqsAckResult>(ack => ack is SqsIgnoreResult r && r.Action.Message.ReceiptHandle == "a-1"); subscriber.ExpectNext <ISqsAckResult>(ack => ack is SqsIgnoreResult r && r.Action.Message.ReceiptHandle == "a-2"); subscriber.Cancel(); }