Akka.Streams.Tests.Dsl.FlowGroupBySpec.GroupBy_must_work_with_empty_input_stream C# (CSharp) Method

        public void GroupBy_must_work_with_empty_input_stream()
        {
            this.AssertAllStagesStopped(() =>
            {
                var publisher =
                    Source.From(new List<int>())
                        .GroupBy(2, x => x%2)
                        .Lift(x => x%2)
                        .RunWith(Sink.AsPublisher<Tuple<int, Source<int, NotUsed>>>(false), Materializer);
                var subscriber = TestSubscriber.CreateManualProbe<Tuple<int, Source<int, NotUsed>>>(this);
                publisher.Subscribe(subscriber);

                subscriber.ExpectSubscriptionAndComplete();
            }, Materializer);
        }