public void RcpMethod_ExistingMethod_InvokedAndTaskResultReturned()
        {
            // ARRANGE
            var jsonRpcMethodRequest = new JsonRpcRequest
            {
                Id     = 1,
                Method = "TestMethod23",
                Params = new List <string>()
            };
            var     jsonRpcMethod = jsonRpcMethodRequest.ToString();
            JObject result        = null;

            _webSocketMock.Setup(m => m.SendAsync(It.IsAny <string>()))
            .Returns(Task.CompletedTask)
            .Callback((string s) =>
            {
                _webSocketMock.Setup(m => m.WebSocketState).Returns(JsonRpcWebSocketState.Closed);
                result = JObject.Parse(s);
            });

            _webSocketMock.Setup(
                m => m.ReceiveAsync(CancellationToken.None))
            .Returns(() =>
                     Task.FromResult((MessageType.Text, new ArraySegment <byte>(Encoding.UTF8.GetBytes(jsonRpcMethod)))));


            // ACT
            _webSocketConnection.HandleMessagesAsync(_webSocketMock.Object, CancellationToken.None).Wait(100);

            // ASSERT
            Assert.That(_webSocketService.MethodsInvoked, Contains.Item("TestMethod2"));
            Assert.That(result, Is.Not.Null);
            Assert.That(jsonRpcMethodRequest.Id, Is.EqualTo(result["id"].Value <int>()));
            Assert.That(result["result"].ToObject <List <string> >(), Is.EqualTo(new List <string> {
                "test", "test"
            }));
        }