Akka.Streams.Tests.IO.InputStreamSinkSpec.InputStreamSink_should_return_Exception_when_stream_is_failed C# (CSharp) Method

        public void InputStreamSink_should_return_Exception_when_stream_is_failed()
        {
            this.AssertAllStagesStopped(() =>
            {
                var sinkProbe = CreateTestProbe();
                var t = this.SourceProbe<ByteString>().ToMaterialized(TestSink(sinkProbe), Keep.Both).Run(_materializer);
                var probe = t.Item1;
                var inputStream = t.Item2;
                var ex = new SystemException("Stream failed.");

                probe.SendNext(_byteString);
                sinkProbe.ExpectMsg<GraphStageMessages.Push>();

                var r = ReadN(inputStream, _byteString.Count);
                r.Item1.Should().Be(_byteString.Count);
                r.Item2.ShouldBeEquivalentTo(_byteString);

                probe.SendError(ex);
                sinkProbe.ExpectMsg<GraphStageMessages.Failure>().Ex.Should().Be(ex);

                var task = Task.Run(() => inputStream.ReadByte());

                Action block = () => task.Wait(Timeout);
                block.ShouldThrow<Exception>();

                task.Exception.InnerException.Should().Be(ex);

            }, _materializer);
        }