Akka.Streams.Tests.Dsl.FlowLogSpec.A_Log_on_source_must_log_upstream_failure C# (CSharp) Method

        public void A_Log_on_source_must_log_upstream_failure()
        {
            var cause = new TestException("test");
            Source.Failed<int>(cause)
                .Log("flow-s4")
                .RunWith(Sink.Ignore<int>(), Materializer);

            var error = LogProbe.ExpectMsg<Error>();
            error.Cause.Should().Be(cause);
            error.Message.ToString().Should().Be("[flow-s4] Upstream failed.");
        }