public async Task Test_No_Next_Comic_When_Current_Is_Last()
{
//Arrange
int mockId = 1000;
int?nextValidId = null;
var mockComicApi = new Mock <IXKCDApi>();
mockComicApi.Setup(api => api.GetFirstComicId())
.ReturnsAsync(GetValidMockedFirstComicId());
mockComicApi.Setup(api => api.GetComicOfTheDay())
.ReturnsAsync(GetValidMockedComicOfTheDay());
mockComicApi.Setup(api => api.GetComicById(nextValidId ?? default))
.ReturnsAsync(GetInvalidComic());
var comicRepository = new ComicRepository(mockComicApi.Object);
//Act
var result = await comicRepository.GetNextComicId(mockId);
var nextComic = await comicRepository.GetComicById(nextValidId ?? default);
var lastComicId = await comicRepository.GetLastComicId();
//Assert
Assert.Null(result);
Assert.Equal(nextValidId, result);
Assert.Null(nextComic);
Assert.Equal(lastComicId, mockId);
}
public async Task Test_Next_Valid_Comic_When_Current_Is_Not_Last()
{
//Arrange
int mockId = 403;
int nextValidId = 406;
var mockComicApi = new Mock <IXKCDApi>();
mockComicApi.Setup(api => api.GetFirstComicId())
.ReturnsAsync(GetValidMockedFirstComicId());
mockComicApi.Setup(api => api.GetComicOfTheDay())
.ReturnsAsync(GetValidMockedComicOfTheDay());
mockComicApi.Setup(api => api.GetComicById(404))
.ReturnsAsync(GetInvalidComic());
mockComicApi.Setup(api => api.GetComicById(405))
.ReturnsAsync(GetInvalidComic());
mockComicApi.Setup(api => api.GetComicById(nextValidId))
.ReturnsAsync(GetMockedComicById(nextValidId));
var comicRepository = new ComicRepository(mockComicApi.Object);
//Act
var result = await comicRepository.GetNextComicId(mockId);
var nextComic = await comicRepository.GetComicById(nextValidId);
//Assert
Assert.NotNull(result);
Assert.Equal(nextValidId, result);
Assert.NotNull(nextComic);
Assert.Equal(nextComic.Num, result);
Assert.Equal($"Testing {result.Value}", nextComic.Alt);
Assert.Equal($"Test comic {result.Value}", nextComic.SafeTitle);
Assert.Equal($"Test comic {result.Value}", nextComic.Title);
mockComicApi.Verify(mock => mock.GetComicById(mockId + 1), Times.Once());
mockComicApi.Verify(mock => mock.GetComicById(mockId + 2), Times.Once());
//Because of the fetch during the act
mockComicApi.Verify(mock => mock.GetComicById(nextValidId), Times.Exactly(2));
mockComicApi.Verify(mock => mock.GetComicById(mockId + 4), Times.Never());
}
