Akka.Streams.Tests.Dsl.GraphPartitionSpec.A_Partition_must_work_with_merge C# (CSharp) Method

        public void A_Partition_must_work_with_merge()
        {
            this.AssertAllStagesStopped(() =>
            {
                var s = Sink.Seq<int>();
                var input = new[] {5, 2, 9, 1, 1, 1, 10};

                var task = RunnableGraph.FromGraph(GraphDsl.Create(s, (b, sink) =>
                {
                    var partition = b.Add(new Partition<int>(2, i => i < 4 ? 0 : 1));
                    var merge = b.Add(new Merge<int>(2));
                    var source = Source.From(input).MapMaterializedValue<Task<IImmutableList<int>>>(_ => null);

                    b.From(source).To(partition.In);
                    b.From(partition.Out(0)).To(merge.In(0));
                    b.From(partition.Out(1)).To(merge.In(1));
                    b.From(merge.Out).To(sink.Inlet);

                    return ClosedShape.Instance;
                })).Run(Materializer);

                task.Wait(TimeSpan.FromSeconds(3)).Should().BeTrue();
                task.Result.ShouldAllBeEquivalentTo(input);
            }, Materializer);
        }