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

            twilioRestClient.AccountSid.Returns("ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
            twilioRestClient.Request(Arg.Any <Request>())
            .Returns(new Response(
                         System.Net.HttpStatusCode.OK,
                         "{\"account_sid\": \"ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"application_sid\": \"APaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"api_version\": \"2008-08-01\",\"date_created\": \"Sun, 15 Mar 2009 02:08:47 +0000\",\"date_updated\": \"Fri, 18 Feb 2011 17:37:18 +0000\",\"phone_number\": \"4155992671\",\"pin\": \"66528411\",\"sms_method\": \"POST\",\"sms_url\": \"http://demo.twilio.com/welcome/sms\",\"status_callback\": null,\"status_callback_method\": null,\"uri\": \"/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Sandbox.json\",\"voice_method\": \"POST\",\"voice_url\": \"http://www.digg.com\"}"
                         ));

            var response = SandboxResource.Update(client: twilioRestClient);

            Assert.NotNull(response);
        }
        public void TestUpdateRequest()
        {
            var twilioRestClient = Substitute.For <ITwilioRestClient>();
            var request          = new Request(
                HttpMethod.Post,
                Twilio.Rest.Domain.Api,
                "/2010-04-01/Accounts/ACaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/Sandbox.json",
                ""
                );

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

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