public void ClientInvokeDelegate() { var port = Interlocked.Increment(ref _nextPort); using (var server = new TestServer(port)) { bool called = false; server.Bind("DelegateFunction", (Func <int, string, string>)((a, b) => { called = b == "abc"; return(b); })); using (var client = new TestClient(port)) { var reply = client.InvokeAsync <string>("DelegateFunction", 1, "abc").Result; reply.Should().Be("abc"); } called.Should().BeTrue(); } }