public async Task DeleteNewsFeedSubscription_Success()
        {
            subscriptionRepository.GetAsync(1).Returns(newsFeedSubscriptions[0]);
            NewsController controller = new NewsController(mapper, rssFeedProvider, subscriptionRepository);

            var result = await controller.DeleteNewsFeedSubscription(1);

            Assert.IsType <NoContentResult>(result);
        }
        public async Task DeleteNewsFeedSubscription_NotFound()
        {
            subscriptionRepository.GetAsync(Arg.Any <int>()).Returns((NewsFeedSubscription)null);
            NewsController controller = new NewsController(mapper, rssFeedProvider, subscriptionRepository);

            var result = await controller.DeleteNewsFeedSubscription(1);

            Assert.IsType <NotFoundResult>(result);
        }