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

        public void A_Flow_with_SelectAsync_must_signal_error_from_MapAsync()
        {
            this.AssertAllStagesStopped(() =>
            {
                var latch = new TestLatch(1);
                var c = TestSubscriber.CreateManualProbe<int>(this);
                Source.From(Enumerable.Range(1, 5))
                    .SelectAsync(4, n =>
                    {
                        if (n == 3)
                            throw new TestException("err2");

                        return Task.Run(() =>
                        {
                            latch.Ready(TimeSpan.FromSeconds(10));
                            return n;
                        });
                    })
                    .RunWith(Sink.FromSubscriber(c), Materializer);
                var sub = c.ExpectSubscription();
                sub.Request(10);
                c.ExpectError().Message.Should().Be("err2");
                latch.CountDown();
            }, Materializer);
        }