Akka.Streams.Tests.Dsl.QueueSourceSpec.QueueSource_should_buffer_when_needed C# (CSharp) Method

        public void QueueSource_should_buffer_when_needed()
        {
            var s = this.CreateManualProbe<int>();
            var queue =
                Source.Queue<int>(100, OverflowStrategy.DropHead)
                    .To(Sink.FromSubscriber(s))
                    .Run(_materializer);
            var sub = s.ExpectSubscription();

            for (var i = 1; i <= 20; i++) AssertSuccess(queue.OfferAsync(i));
            sub.Request(10);
            for (var i = 1; i <= 10; i++) AssertSuccess(queue.OfferAsync(i));
            sub.Request(10);
            for (var i = 11; i <= 20; i++) AssertSuccess(queue.OfferAsync(i));

            for (var i = 200; i <= 399; i++) AssertSuccess(queue.OfferAsync(i));
            sub.Request(100);
            for (var i = 300; i <= 399; i++) AssertSuccess(queue.OfferAsync(i));
            sub.Cancel();
        }