Akka.Streams.Tests.Dsl.FlowGroupBySpec.GroupBy_must_work_in_normal_user_scenario C# (CSharp) Метод

        public void GroupBy_must_work_in_normal_user_scenario()
        {
            var source = Source.From(new[] {"Aaa", "Abb", "Bcc", "Cdd", "Cee"})
                .GroupBy(3, s => s.Substring(0, 1))
                .Grouped(10)
                .MergeSubstreams()
                .Grouped(10);
            var task =
                ((Source<IEnumerable<IEnumerable<string>>, NotUsed>) source).RunWith(
                    Sink.First<IEnumerable<IEnumerable<string>>>(), Materializer);
            task.Wait(TimeSpan.FromSeconds(3)).Should().BeTrue();
            task.Result.OrderBy(e => e.First())
                .ShouldBeEquivalentTo(new[] {new[] {"Aaa", "Abb"}, new[] {"Bcc"}, new[] {"Cdd", "Cee"}});
        }