Akka.Streams.Tests.Dsl.QueueSinkSpec.QueueSink_should_allow_to_have_only_one_future_waiting_for_result_in_each_point_in_time C# (CSharp) Метод

        public void QueueSink_should_allow_to_have_only_one_future_waiting_for_result_in_each_point_in_time()
        {
            this.AssertAllStagesStopped(() =>
            {
                var probe = TestPublisher.CreateManualProbe<int>(this);
                var queue = Source.FromPublisher(probe).RunWith(Sink.Queue<int>(), _materializer);
                var sub = probe.ExpectSubscription();
                var future = queue.PullAsync();
                var future2 = queue.PullAsync();
                future2.Invoking(t => t.Wait(TimeSpan.FromMilliseconds(300))).ShouldThrow<IllegalStateException>();

                sub.SendNext(1);
                future.PipeTo(TestActor);
                ExpectMsg(new Option<int>(1));

                sub.SendComplete();
                queue.PullAsync();
            }, _materializer);
        }