Akka.Streams.Tests.Dsl.FlowIdleInjectSpec.KeepAlive_must_emit_elements_periodically_after_silent_periods C# (CSharp) Method

        public void KeepAlive_must_emit_elements_periodically_after_silent_periods()
        {
            this.AssertAllStagesStopped(() =>
            {
                var sourceWithIdleGap = Source.Combine(Source.From(Enumerable.Range(1, 5)),
                    Source.From(Enumerable.Range(6, 5)).InitialDelay(TimeSpan.FromSeconds(2)),
                    i => new Merge<int, int>(i));
                

                var result = sourceWithIdleGap
                    .KeepAlive(TimeSpan.FromSeconds(0.6), () => 0)
                    .Grouped(1000)
                    .RunWith(Sink.First<IEnumerable<int>>(), Materializer);

                result.Wait(TimeSpan.FromSeconds(3)).Should().BeTrue();
                result.Result.ShouldAllBeEquivalentTo(
                    Enumerable.Range(1, 5).Concat(new[] {0, 0, 0}).Concat(Enumerable.Range(6, 5)));
            }, Materializer);
        }