public void AddPermissionMarshallTest()
        {
            var operation = service_model.FindOperation("AddPermission");

            var request = InstantiateClassGenerator.Execute<AddPermissionRequest>();
            var marshaller = new AddPermissionRequestMarshaller();

            var internalRequest = marshaller.Marshall(request);
            RequestValidator.Validate("AddPermission", request, internalRequest, service_model);            

            var webResponse = new WebResponseData
            {
                Headers = {
                    {"x-amzn-RequestId", Guid.NewGuid().ToString()},
                    {"x-amz-crc32","0"}
                }
            };

            var payloadResponse = new JsonSampleGenerator(service_model, operation.ResponseStructure).Execute();
            webResponse.Headers.Add("Content-Length", UTF8Encoding.UTF8.GetBytes(payloadResponse).Length.ToString());
            var context = new JsonUnmarshallerContext(Utils.CreateStreamFromString(payloadResponse), false, webResponse);
            ResponseUnmarshaller unmarshaller = AddPermissionResponseUnmarshaller.Instance;
            var response = unmarshaller.Unmarshall(context)
                as AddPermissionResponse;   
            InstantiateClassGenerator.ValidateObjectFullyInstantiated(response);               
        }

        public void AddEventSourceMarshallTestForDataTypeCustomization()
        {
            var operation = service_model.FindOperation("AddEventSource");

            var request = InstantiateClassGenerator.Execute<AddEventSourceRequest>();
            var marshaller = new AddEventSourceRequestMarshaller();

            var internalRequest = marshaller.Marshall(request);
            RequestValidator.Validate("AddEventSource", request, internalRequest, service_model);

            var webResponse = new WebResponseData
            {
                Headers = {
                    {"x-amzn-RequestId", Guid.NewGuid().ToString()},
                    {"x-amz-crc32","0"}
                }
            };

            var payloadResponse = new JsonSampleGenerator(service_model, operation.ResponseStructure).Execute();

            // The service returns IsActive as a string and it's unmarshalled as a bool to set the 
            // AddEventSourceResponse.IsActive bool property.
            if (payloadResponse.Contains("\"IsActive\"     : true"))
                payloadResponse = payloadResponse.Replace("\"IsActive\"     : true", "\"IsActive\"     : \"true\"");
            else
                throw new InvalidOperationException("Could not replace json in sample response");

            webResponse.Headers.Add("Content-Length", UTF8Encoding.UTF8.GetBytes(payloadResponse).Length.ToString());
            var context = new JsonUnmarshallerContext(Utils.CreateStreamFromString(payloadResponse), false, webResponse);
            ResponseUnmarshaller unmarshaller = AddEventSourceResponseUnmarshaller.Instance;
            var response = unmarshaller.Unmarshall(context)
                as AddEventSourceResponse;
            InstantiateClassGenerator.ValidateObjectFullyInstantiated(response);
        }

        public void CreateClusterMarshallTest()
        {
            var request = InstantiateClassGenerator.Execute<CreateClusterRequest>();
            var marshaller = new CreateClusterRequestMarshaller();

            var internalRequest = marshaller.Marshall(request);
            var jsonRequest = UTF8Encoding.UTF8.GetString(internalRequest.Content);                        
            Comparer.CompareObjectToJson<CreateClusterRequest>(request,jsonRequest);

            var webResponse = new WebResponseData
            {
                Headers = {
                    {"x-amzn-RequestId", Guid.NewGuid().ToString()},
                    {"x-amz-crc32","0"}
                }
            };
            var jsonResponse = new JsonSampleGenerator(service_model, service_model.FindOperation("CreateCluster").ResponseStructure).Execute();
            webResponse.Headers.Add("Content-Length", UTF8Encoding.UTF8.GetBytes(jsonResponse).Length.ToString());
            UnmarshallerContext context = new JsonUnmarshallerContext(Utils.CreateStreamFromString(jsonResponse), false, webResponse);
            var response = CreateClusterResponseUnmarshaller.Instance.Unmarshall(context)
                as CreateClusterResponse;
            InstantiateClassGenerator.ValidateObjectFullyInstantiated(response);
        }

        public void GetJobOutputMarshallTest()
        {
            var operation = service_model.FindOperation("GetJobOutput");

            var request = InstantiateClassGenerator.Execute<GetJobOutputRequest>();
            var marshaller = new GetJobOutputRequestMarshaller();

            var internalRequest = marshaller.Marshall(request);
            RequestValidator.Validate("GetJobOutput", request, internalRequest, service_model);            

            var webResponse = new WebResponseData
            {
                Headers = {
                    {"Accept-Ranges","Accept-Ranges_Value"},
                    {"x-amz-archive-description","x-amz-archive-description_Value"},
                    {"x-amz-sha256-tree-hash","x-amz-sha256-tree-hash_Value"},
                    {"Content-Range","Content-Range_Value"},
                    {"Content-Type","Content-Type_Value"},
                    {"x-amzn-RequestId", Guid.NewGuid().ToString()},
                    {"x-amz-crc32","0"}
                }
            };

            var payloadResponse = new JsonSampleGenerator(service_model, operation.ResponseStructure).Execute();
            webResponse.Headers.Add("Content-Length", UTF8Encoding.UTF8.GetBytes(payloadResponse).Length.ToString());
            var context = new JsonUnmarshallerContext(Utils.CreateStreamFromString(payloadResponse), false, webResponse);
            ResponseUnmarshaller unmarshaller = GetJobOutputResponseUnmarshaller.Instance;
            var response = unmarshaller.Unmarshall(context)
                as GetJobOutputResponse;   
            InstantiateClassGenerator.ValidateObjectFullyInstantiated(response);               
        }

        public void SynthesizeSpeechMarshallTest()
        {
            var operation = service_model.FindOperation("SynthesizeSpeech");

            var request = InstantiateClassGenerator.Execute<SynthesizeSpeechRequest>();
            var marshaller = new SynthesizeSpeechRequestMarshaller();

            var internalRequest = marshaller.Marshall(request);
            RequestValidator.Validate("SynthesizeSpeech", request, internalRequest, service_model);            

            var webResponse = new WebResponseData
            {
                Headers = {
                    {"Content-Type","Content-Type_Value"},
                    {"x-amzn-RequestCharacters",int.MaxValue.ToString(CultureInfo.InvariantCulture)},
                    {"x-amzn-RequestId", Guid.NewGuid().ToString()},
                    {"x-amz-crc32","0"}
                }
            };

            var payloadResponse = new JsonSampleGenerator(service_model, operation.ResponseStructure).Execute();
            webResponse.Headers.Add("Content-Length", UTF8Encoding.UTF8.GetBytes(payloadResponse).Length.ToString());
            var context = new JsonUnmarshallerContext(Utils.CreateStreamFromString(payloadResponse), false, webResponse);
            ResponseUnmarshaller unmarshaller = SynthesizeSpeechResponseUnmarshaller.Instance;
            var response = unmarshaller.Unmarshall(context)
                as SynthesizeSpeechResponse;   
            InstantiateClassGenerator.ValidateObjectFullyInstantiated(response);               
        }

        void Generate(ServiceModel model, string operationName, out string requestJson, out string responseJson)
        {
            var operation = model.Operations.First(x => x.Name == operationName);
            JsonSampleGenerator generator = new JsonSampleGenerator(model, operation.RequestStructure);
            requestJson = generator.Execute();

            generator = new JsonSampleGenerator(model, operation.ResponseStructure);
            responseJson = generator.Execute();
        }