public void TestFetchResponse()
        {
            var twilioRestClient = Substitute.For <ITwilioRestClient>();

            twilioRestClient.AccountSid.Returns("ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
            twilioRestClient.Request(Arg.Any <Request>())
            .Returns(new Response(
                         System.Net.HttpStatusCode.OK,
                         "{\"sid\": \"FOaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"account_sid\": \"ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"date_created\": \"2016-08-01T22:10:40Z\",\"date_updated\": \"2016-08-01T22:10:40Z\",\"friendly_name\": \"friendly_name\",\"chat_service_sid\": \"SIaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"channel_type\": \"sms\",\"contact_identity\": \"12345\",\"enabled\": true,\"integration_type\": \"studio\",\"integration\": {\"flow_sid\": \"FWaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"},\"long_lived\": true,\"url\": \"https://flex-api.twilio.com/v1/FlexFlows/FOaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"}"
                         ));

            var response = FlexFlowResource.Fetch("FOXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", client: twilioRestClient);

            Assert.NotNull(response);
        }
        public void TestFetchRequest()
        {
            var twilioRestClient = Substitute.For <ITwilioRestClient>();
            var request          = new Request(
                HttpMethod.Get,
                Twilio.Rest.Domain.FlexApi,
                "/v1/FlexFlows/FOXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
                ""
                );

            twilioRestClient.Request(request).Throws(new ApiException("Server Error, no content"));

            try
            {
                FlexFlowResource.Fetch("FOXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", client: twilioRestClient);
                Assert.Fail("Expected TwilioException to be thrown for 500");
            }
            catch (ApiException) {}
            twilioRestClient.Received().Request(request);
        }