Akka.Streams.Tests.Dsl.FlowSplitWhenSpec.SplitWhen_must_fail_stream_when_SplitWhen_function_throws C# (CSharp) Метод

        public void SplitWhen_must_fail_stream_when_SplitWhen_function_throws()
        {
            this.AssertAllStagesStopped(() =>
            {
                var publisherProbe = TestPublisher.CreateManualProbe<int>(this);
                var ex = new TestException("test");
                var publisher = Source.FromPublisher(publisherProbe).SplitWhen(i =>
                {
                    if (i == 3)
                        throw ex;
                    return i % 3 == 0;
                }).Lift().RunWith(Sink.AsPublisher<Source<int, NotUsed>>(false), Materializer);

                var subscriber = TestSubscriber.CreateManualProbe<Source<int, NotUsed>>(this);
                publisher.Subscribe(subscriber);

                var upstreamSubscription = publisherProbe.ExpectSubscription();
                var downstreamSubscription = subscriber.ExpectSubscription();

                downstreamSubscription.Request(100);
                upstreamSubscription.SendNext(1);

                var substream = subscriber.ExpectNext();
                var substreamPuppet = new StreamPuppet(substream.RunWith(Sink.AsPublisher<int>(false), Materializer), this);

                substreamPuppet.Request(10);
                substreamPuppet.ExpectNext(1);

                upstreamSubscription.SendNext(2);
                substreamPuppet.ExpectNext(2);

                upstreamSubscription.SendNext(3);

                subscriber.ExpectError().Should().Be(ex);
                substreamPuppet.ExpectError(ex);
                upstreamSubscription.ExpectCancellation();
            }, Materializer);
        }