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);
}