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

        public void QueueSource_should_finish_offer_and_complete_futures_when_stream_completed()
        {
            this.AssertAllStagesStopped(() =>
            {
                var s = this.CreateManualProbe<int>();
                var queue =
                    Source.Queue<int>(0, OverflowStrategy.DropHead)
                        .To(Sink.FromSubscriber(s))
                        .Run(_materializer);
                var sub = s.ExpectSubscription();

                queue.WatchCompletionAsync()
                    .ContinueWith(t => "done", TaskContinuationOptions.OnlyOnRanToCompletion)
                    .PipeTo(TestActor);
                queue.OfferAsync(1).PipeTo(TestActor);
                ExpectNoMsg(_pause);

                sub.Cancel();

                ExpectMsgAllOf<object>(QueueClosed.Instance, "done");
            }, _materializer);
        }