Akka.Streams.Tests.Dsl.FlowPrefixAndTailSpec.PrefixAndTail_must_shut_down_main_stage_if_substream_is_empty_even_when_not_subscribed C# (CSharp) Method

        public void PrefixAndTail_must_shut_down_main_stage_if_substream_is_empty_even_when_not_subscribed()
        {
            this.AssertAllStagesStopped(() =>
            {
                var futureSink = NewHeadSink;
                var fut = Source.Single(1).PrefixAndTail(1).RunWith(futureSink, Materializer);
                fut.Wait(TimeSpan.FromSeconds(3)).Should().BeTrue();
                fut.Result.Item1.Should().ContainSingle(i => i == 1);
            }, Materializer);
        }