Akka.Streams.Tests.Dsl.FlowConflateSpec.Conflate_must_restart_when_aggregate_throws_and_a_RestartingDecider_is_used C# (CSharp) Method

        public void Conflate_must_restart_when_aggregate_throws_and_a_RestartingDecider_is_used()
        {
            var sourceProbe = TestPublisher.CreateProbe<string>(this);
            var sinkProbe = TestSubscriber.CreateProbe<string>(this);
            var latch = new TestLatch();

            var conflate = Flow.Create<string>().ConflateWithSeed(i => i, (state, elem) =>
            {
                if (elem == "two")
                {
                    latch.Open();
                    throw new TestException("two is a three letter word");
                }

                return state + elem;
            }).WithAttributes(ActorAttributes.CreateSupervisionStrategy(Deciders.RestartingDecider));

            var graph = Source.FromPublisher(sourceProbe)
                .Via(conflate)
                .To(Sink.FromSubscriber(sinkProbe))
                .WithAttributes(Attributes.CreateInputBuffer(4, 4));
            RunnableGraph.FromGraph(graph).Run(Materializer);

            var sub = sourceProbe.ExpectSubscription();

            sub.ExpectRequest(4);
            sub.SendNext("one");
            sub.SendNext("two");
            sub.SendNext("three");
            sub.SendComplete();

            //"one" should be lost
            latch.Ready(TimeSpan.FromSeconds(3));
            sinkProbe.RequestNext("three");
        }