Akka.Streams.Tests.Dsl.FlowSelectAsyncSpec.A_Flow_with_SelectAsync_must_signal_task_failure C# (CSharp) Метод

        public void A_Flow_with_SelectAsync_must_signal_task_failure()
        {
            this.AssertAllStagesStopped(() =>
            {
                var latch = new TestLatch(1);
                var c = TestSubscriber.CreateManualProbe<int>(this);
                Source.From(Enumerable.Range(1, 5))
                    .SelectAsync(4, n => Task.Run(() =>
                    {
                        if (n == 3)
                            throw new TestException("err1");

                        latch.Ready(TimeSpan.FromSeconds(10));
                        return n;
                    }))
                    .To(Sink.FromSubscriber(c)).Run(Materializer);
                var sub = c.ExpectSubscription();
                sub.Request(10);
                c.ExpectError().InnerException.Message.Should().Be("err1");
                latch.CountDown();
            }, Materializer);
        }