Akka.Streams.Tests.IO.FileSinkSpec.SynchronousFileSink_should_use_dedicated_blocking_io_dispatcher_by_default C# (CSharp) Method

        public void SynchronousFileSink_should_use_dedicated_blocking_io_dispatcher_by_default()
        {
            this.AssertAllStagesStopped(() =>
            {
                TargetFile(f =>
                {
                    var sys = ActorSystem.Create("dispatcher-testing", Utils.UnboundedMailboxConfig);
                    var materializer = ActorMaterializer.Create(sys);

                    try
                    {
                        //hack for Iterator.continually
                        Source.FromEnumerator(() => Enumerable.Repeat(_testByteStrings.Head(), Int32.MaxValue).GetEnumerator())
                            .RunWith(FileIO.ToFile(f), materializer);

                        ((ActorMaterializerImpl)materializer).Supervisor.Tell(StreamSupervisor.GetChildren.Instance, TestActor);
                        var refs = ExpectMsg<StreamSupervisor.Children>().Refs;
                        //NOTE: Akka uses "fileSource" as name for DefaultAttributes.FileSink - I think it's mistake on the JVM implementation side
                        var actorRef = refs.First(@ref => @ref.Path.ToString().Contains("fileSink"));
                        Utils.AssertDispatcher(actorRef, "akka.stream.default-blocking-io-dispatcher");
                    }
                    finally
                    {
                        Shutdown(sys);
                    }
                });
            }, _materializer);
        }