public void MutateFeedMappings()
        {
            Mock <FeedMappingService.FeedMappingServiceClient> mockGrpcClient = new Mock <FeedMappingService.FeedMappingServiceClient>(MockBehavior.Strict);
            MutateFeedMappingsRequest expectedRequest = new MutateFeedMappingsRequest
            {
                CustomerId     = "customerId-1772061412",
                Operations     = { },
                PartialFailure = true,
                ValidateOnly   = false,
            };
            MutateFeedMappingsResponse expectedResponse = new MutateFeedMappingsResponse();

            mockGrpcClient.Setup(x => x.MutateFeedMappings(expectedRequest, It.IsAny <CallOptions>()))
            .Returns(expectedResponse);
            FeedMappingServiceClient client = new FeedMappingServiceClientImpl(mockGrpcClient.Object, null);
            string customerId = "customerId-1772061412";
            IEnumerable <FeedMappingOperation> operations = new List <FeedMappingOperation>();
            bool partialFailure = true;
            bool validateOnly   = false;
            MutateFeedMappingsResponse response = client.MutateFeedMappings(customerId, operations, partialFailure, validateOnly);

            Assert.AreEqual(expectedResponse, response);
            mockGrpcClient.VerifyAll();
        }