Akka.Streams.Tests.Dsl.FlowSplitWhenSpec.SplitWhen_must_work_when_first_element_is_split_by C# (CSharp) Method

        public void SplitWhen_must_work_when_first_element_is_split_by()
        {
            this.AssertAllStagesStopped(() =>
            {
                WithSubstreamsSupport(1, 3, run: (masterSubscriber, masterSubscription, getSubFlow) =>
                {
                    var s1 = new StreamPuppet(getSubFlow().RunWith(Sink.AsPublisher<int>(false), Materializer), this);
                   
                    s1.Request(5);
                    s1.ExpectNext(1);
                    s1.ExpectNext(2);
                    s1.ExpectNext(3);
                    s1.ExpectComplete();

                    masterSubscription.Request(1);
                    masterSubscriber.ExpectComplete();
                });
            }, Materializer);
        }