Akka.Streams.Tests.Dsl.FlowScanSpec.A_Scan_must_emit_values_promptly C# (CSharp) Метод

        public void A_Scan_must_emit_values_promptly()
        {
            var task = Source.Single(1).MapMaterializedValue<TaskCompletionSource<int>>(_ => null)
                .Concat(Source.Maybe<int>())
                .Scan(0, (i, i1) => i + i1)
                .Take(2)
                .RunWith(Sink.Seq<int>(), Materializer);

            task.Wait(TimeSpan.FromSeconds(1)).Should().BeTrue();
            task.Result.ShouldAllBeEquivalentTo(new[] {0, 1});
        }