Akka.Streams.Tests.Dsl.FlowIntersperseSpec.A_Intersperse_must_demonstrate_how_to_prepend_only C# (CSharp) Method

        public void A_Intersperse_must_demonstrate_how_to_prepend_only()
        {
            var probe =
                Source.Combine(Source.Single(">> "), Source.From(new[] {"1", "2", "3"}).Intersperse(","),
                    i => new Merge<string, string>(i)).RunWith(this.SinkProbe<string>(), Materializer);

            probe.ExpectSubscription();
            probe.ToStrict(TimeSpan.FromSeconds(1)).Aggregate((s, s1) => s + s1).Should().Be(">> 1,2,3");
        }