Akka.Streams.Tests.Dsl.FlowConcatAllSpec.ConcatAll_must_on_OnError_on_opening_substream_cancel_the_master_stream_and_signal_error C# (CSharp) Метод

        public void ConcatAll_must_on_OnError_on_opening_substream_cancel_the_master_stream_and_signal_error()
        {
            this.AssertAllStagesStopped(() =>
            {
                var publisher = TestPublisher.CreateManualProbe<Source<int, NotUsed>>(this);
                var subscriber = TestSubscriber.CreateManualProbe<int>(this);
                Source.FromPublisher(publisher)
                    .ConcatMany<Source<int,NotUsed>,int,NotUsed>(x => { throw TestException; })
                    .To(Sink.FromSubscriber(subscriber))
                    .Run(Materializer);

                var upstream = publisher.ExpectSubscription();
                var downstream = subscriber.ExpectSubscription();
                downstream.Request(1000);

                var substreamPublisher = TestPublisher.CreateManualProbe<int>(this);
                var substreamFlow = Source.FromPublisher(substreamPublisher);
                upstream.ExpectRequest();
                upstream.SendNext(substreamFlow);
                subscriber.ExpectError().Should().Be(TestException);
                upstream.ExpectCancellation();
            }, Materializer);
        }