public void UpdateNotificationChannel()
        {
            Mock <NotificationChannelService.NotificationChannelServiceClient> mockGrpcClient = new Mock <NotificationChannelService.NotificationChannelServiceClient>(MockBehavior.Strict);
            UpdateNotificationChannelRequest expectedRequest = new UpdateNotificationChannelRequest
            {
                UpdateMask          = new FieldMask(),
                NotificationChannel = new NotificationChannel(),
            };
            NotificationChannel expectedResponse = new NotificationChannel
            {
                Type        = "type3575610",
                Name        = "name3373707",
                DisplayName = "displayName1615086568",
                Description = "description-1724546052",
            };

            mockGrpcClient.Setup(x => x.UpdateNotificationChannel(expectedRequest, It.IsAny <CallOptions>()))
            .Returns(expectedResponse);
            NotificationChannelServiceClient client = new NotificationChannelServiceClientImpl(mockGrpcClient.Object, null);
            FieldMask           updateMask          = new FieldMask();
            NotificationChannel notificationChannel = new NotificationChannel();
            NotificationChannel response            = client.UpdateNotificationChannel(updateMask, notificationChannel);

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