public void A_FlattenMerge_must_cancel_substreams_when_failing_map_function()
{
var settings = ActorMaterializerSettings.Create(Sys).WithSyncProcessingLimit(1);
var materializer = ActorMaterializer.Create(Sys, settings);
var p = TestPublisher.CreateProbe<int>(this);
var ex = new TestException("buh");
var latch = new TestLatch();
Source.From(Enumerable.Range(1, 3)).MergeMany(10, i =>
{
if (i == 1)
return Source.FromPublisher(p);
latch.Ready(TimeSpan.FromSeconds(3));
throw ex;
}).RunWith(Sink.First<int>(), materializer);
p.ExpectRequest();
latch.CountDown();
p.ExpectCancellation();
}