public async Task Test_No_Previous_Comic_When_Current_Is_First()
{
//Arrange
int mockId = 1;
int?previousValidId = 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(previousValidId ?? default))
.ReturnsAsync(GetInvalidComic());
var comicRepository = new ComicRepository(mockComicApi.Object);
//Act
var result = await comicRepository.GetPreviousComicId(mockId);
var previousComic = await comicRepository.GetComicById(previousValidId ?? default);
var firstComicId = await comicRepository.GetFirstComicId();
//Assert
Assert.Null(result);
Assert.Equal(previousValidId, result);
Assert.Null(previousComic);
Assert.Equal(firstComicId, mockId);
}
