private void WithSubstreamsSupport(int splitWhen = 3, int elementCount = 6,
SubstreamCancelStrategy substreamCancelStrategy = SubstreamCancelStrategy.Drain,
Action <TestSubscriber.ManualProbe <Source <int, NotUsed> >, ISubscription, Func <Source <int, NotUsed> > > run = null)
{
var source = Source.From(Enumerable.Range(1, elementCount));
var groupStream =
source.SplitWhen(substreamCancelStrategy, i => i == splitWhen)
.Lift()
.RunWith(Sink.AsPublisher <Source <int, NotUsed> >(false), Materializer);
var masterSubscriber = TestSubscriber.CreateManualSubscriberProbe <Source <int, NotUsed> >(this);
groupStream.Subscribe(masterSubscriber);
var masterSubscription = masterSubscriber.ExpectSubscription();
run?.Invoke(masterSubscriber, masterSubscription, () =>
{
masterSubscription.Request(1);
return(masterSubscriber.ExpectNext());
});
}