Akka.Streams.Tests.Dsl.ActorRefSourceSpec.A_ActorRefSource_must_buffer_when_needed C# (CSharp) Method

        public void A_ActorRefSource_must_buffer_when_needed()
        {
            var s = TestSubscriber.CreateManualProbe<int>(this);
            var actorRef = Source.ActorRef<int>(100, OverflowStrategy.DropHead)
                .To(Sink.FromSubscriber(s))
                .Run(Materializer);
            var sub = s.ExpectSubscription();
            Enumerable.Range(1, 20).ForEach(x => actorRef.Tell(x));
            sub.Request(10);
            Enumerable.Range(1, 10).ForEach(x => s.ExpectNext(x));
            sub.Request(10);
            Enumerable.Range(11, 10).ForEach(x => s.ExpectNext(x));

            Enumerable.Range(200, 200).ForEach(x => actorRef.Tell(x));
            sub.Request(100);
            Enumerable.Range(300, 100).ForEach(x => s.ExpectNext(x));
        }