Akka.Streams.Tests.Dsl.SourceSpec.Unfold_Source_must_terminate_with_a_failure_if_there_is_an_exception_thrown C# (CSharp) Method

        public void Unfold_Source_must_terminate_with_a_failure_if_there_is_an_exception_thrown()
        {
            EventFilter.Exception<SystemException>(message: "expected").ExpectOne(() =>
            {
                var task = Source.Unfold(Tuple.Create(0, 1), tuple =>
                {
                    var a = tuple.Item1;
                    var b = tuple.Item2;
                    if (a > 10000000)
                        throw new SystemException("expected");
                    return Tuple.Create(Tuple.Create(b, a + b), a);
                }).RunAggregate(new LinkedList<int>(), (ints, i) =>
                {
                    ints.AddFirst(i);
                    return ints;
                }, Materializer);
                task.Invoking(t => t.Wait(TimeSpan.FromSeconds(3)))
                    .ShouldThrow<SystemException>()
                    .WithMessage("expected");
            });
        }