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\": \"DYaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"account_sid\": \"ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"chat_service_sid\": \"ISaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"conversation_sid\": \"CHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"message_sid\": \"IMaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"channel_message_sid\": \"SMaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"status\": \"failed\",\"error_code\": 3000,\"participant_sid\": \"MBaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"date_created\": \"2016-03-24T20:37:57Z\",\"date_updated\": \"2016-03-24T20:37:57Z\",\"url\": \"https://conversations.twilio.com/v1/Services/ISaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Conversations/CHaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Messages/IMaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Receipts/DYaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"}"
                         ));

            var response = DeliveryReceiptResource.Fetch("ISXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "CHXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "IMXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "DYXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", client: twilioRestClient);

            Assert.NotNull(response);
        }
        public void TestFetchRequest()
        {
            var twilioRestClient = Substitute.For <ITwilioRestClient>();
            var request          = new Request(
                HttpMethod.Get,
                Twilio.Rest.Domain.Conversations,
                "/v1/Services/ISXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Conversations/CHXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Messages/IMXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Receipts/DYXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
                ""
                );

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

            try
            {
                DeliveryReceiptResource.Fetch("ISXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "CHXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "IMXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "DYXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", client: twilioRestClient);
                Assert.Fail("Expected TwilioException to be thrown for 500");
            }
            catch (ApiException) {}
            twilioRestClient.Received().Request(request);
        }