Akka.Streams.Tests.Dsl.FlowJoinSpec.A_Flow_using_Join_must_allow_for_merge_cycle C# (CSharp) Method

        public void A_Flow_using_Join_must_allow_for_merge_cycle()
        {
            this.AssertAllStagesStopped(() =>
            {
                var source =
                    Source.Single("lonely traveler").MapMaterializedValue(_ => Task.FromResult(""));

                var flow1 = Flow.FromGraph(GraphDsl.Create(Sink.First<string>(), (b, sink) =>
                {
                    var merge = b.Add(new Merge<string>(2));
                    var broadcast = b.Add(new Broadcast<string>(2, true));

                    b.From(source).To(merge.In(0));
                    b.From(merge.Out).To(broadcast.In);
                    b.From(broadcast.Out(0)).To(sink);
                    return new FlowShape<string, string>(merge.In(1), broadcast.Out(1));
                }));

                var t = flow1.Join(Flow.Create<string>()).Run(Materializer);
                t.Wait(TimeSpan.FromSeconds(3)).Should().BeTrue();
                t.Result.Should().Be("lonely traveler");
            }, Materializer);
        }