public void SetUp()
{
_endPointMock = new Mock <ICachedStoriesEndPointDecorator>();
_endPointMock.Setup(e => e.GetBestStoriesAsync(CancellationToken.None))
.ReturnsAsync(() => StoriesTestHelper.GenerateStories(200).ToList());
_loggerMock = new Mock <ILogger <StoriesController> >();
_storiesController = new StoriesController(_endPointMock.Object, _loggerMock.Object);
}
public async Task UseCachingService()
{
var stories = StoriesTestHelper.GenerateStories(200).ToList();
_storiesEndPointMock.Setup(e => e.GetBestStoriesAsync(It.IsAny <CancellationToken>()))
.ReturnsAsync(() => stories);
var result = await _cachedEndPoint.GetBestStoriesAsync(CancellationToken.None);
// Expecting a call to StoriesEndPoint to get data
_storiesEndPointMock.Verify(s => s.GetBestStoriesAsync(It.IsAny <CancellationToken>()), Times.Once);
Assert.AreEqual(200, result.Count);
_storiesCachingService.Setup(c => c.Get()).Returns(() => stories);
result = await _cachedEndPoint.GetBestStoriesAsync(CancellationToken.None);
// Verifying that after 2 calls the underlying service has only been called once and instead the data must have been retrieved from the cache
_storiesEndPointMock.Verify(s => s.GetBestStoriesAsync(It.IsAny <CancellationToken>()), Times.Once);
Assert.AreEqual(200, result.Count);
}