Akka.Streams.Tests.Implementation.TimeoutsSpec.InitialTimeout_must_fail_if_no_initial_element_passes_until_timeout C# (CSharp) Метод

        public void InitialTimeout_must_fail_if_no_initial_element_passes_until_timeout()
        {
            this.AssertAllStagesStopped(() =>
            {
                var downstreamProbe = this.CreateProbe<int>();
                Source.Maybe<int>()
                .InitialTimeout(TimeSpan.FromSeconds(1))
                .RunWith(Sink.FromSubscriber(downstreamProbe), Materializer);

                downstreamProbe.ExpectSubscription();
                downstreamProbe.ExpectNoMsg(TimeSpan.FromMilliseconds(500));

                var ex = downstreamProbe.ExpectError();
                ex.Message.Should().Be($"The first element has not yet passed through in {TimeSpan.FromSeconds(1)}.");
            }, Materializer);
        }