public void Test_Response_Error()
        {
            // Arrange
            JObject payload_error = new JObject();

            payload_error.Add("type", "INVALID_SOMETHING");
            payload_error.Add("message", "ERROR_MESSAGE");
            AlexaResponse ar = new AlexaResponse("Alexa", "ErrorResponse");

            ar.SetPayload(payload_error.ToString());

            // Act
            JObject response = JObject.Parse(ar.ToString());

            System.Console.WriteLine(response);

            // Assert
            Assert.AreEqual(response["event"]["header"]["name"].ToString(), "ErrorResponse");
            Assert.AreEqual(response["event"]["payload"]["type"].ToString(), "INVALID_SOMETHING");
            Assert.AreEqual(response["event"]["payload"]["message"].ToString(), "ERROR_MESSAGE");
        }