public void FlowGraphs_when_turned_into_sources_should_work_with_a_Sink_when_having_KeyedSource_inside()
{
var probe = TestSubscriber.CreateManualProbe<int>(this);
var source = Source.AsSubscriber<int>();
var mm = source.To(Sink.FromSubscriber(probe)).Run(Materializer);
Source1.To(Sink.FromSubscriber(mm)).Run(Materializer);
ValidateProbe(probe, 4, new[] {0, 1, 2, 3});
}