Akka.Streams.Tests.Dsl.SourceSpec.Composite_Source_must_merge_from_many_inputs C# (CSharp) Method

        public void Composite_Source_must_merge_from_many_inputs()
        {
            var probes = Enumerable.Range(1, 5).Select(_ => TestPublisher.CreateManualProbe<int>(this)).ToList();
            var source = Source.AsSubscriber<int>();
            var outProbe = TestSubscriber.CreateManualProbe<int>(this);

            var s =
                Source.FromGraph(GraphDsl.Create(source, source, source, source, source,
                    (a, b, c, d, e) => new[] {a, b, c, d, e},
                    (b, i0, i1, i2, i3, i4) =>
                    {
                        var m = b.Add(new Merge<int>(5));
                        b.From(i0.Outlet).To(m.In(0));
                        b.From(i1.Outlet).To(m.In(1));
                        b.From(i2.Outlet).To(m.In(2));
                        b.From(i3.Outlet).To(m.In(3));
                        b.From(i4.Outlet).To(m.In(4));
                        return new SourceShape<int>(m.Out);
                    })).To(Sink.FromSubscriber(outProbe)).Run(Materializer);

            for (var i = 0; i < 5; i++)
                probes[i].Subscribe(s[i]);
            var sub = outProbe.ExpectSubscription();
            sub.Request(10);

            for (var i = 0; i < 5; i++)
            {
                var subscription = probes[i].ExpectSubscription();
                subscription.ExpectRequest();
                subscription.SendNext(i);
                subscription.SendComplete();
            }

            var gotten = new List<int>();
            for (var i = 0; i < 5; i++)
                gotten.Add(outProbe.ExpectNext());
            gotten.ShouldAllBeEquivalentTo(new[] {0, 1, 2, 3, 4});
            outProbe.ExpectComplete();
        }