public async Task GetAverageRatingByBookIdShouldZeroWhenBookIdIsInvalid()
{
var options = new DbContextOptionsBuilder <AlexandriaDbContext>()
.UseInMemoryDatabase(Guid.NewGuid().ToString())
.Options;
var db = new AlexandriaDbContext(options);
var ratings = new List <StarRating>();
for (int i = 1; i <= 2; i++)
{
ratings.Add(
new StarRating
{
Rate = 5,
UserId = "userId",
BookId = 1,
});
}
await db.StarRatings.AddRangeAsync(ratings);
await db.SaveChangesAsync();
var ratingsService = new StarRatingsService(db);
var result = await ratingsService.GetAverageRatingByBookIdAsync(5);
Assert.Equal(0, result);
}
public async Task GetAverageRatingByBookIdShouldZeroWhenRatingsIsEmpty()
{
var options = new DbContextOptionsBuilder <AlexandriaDbContext>()
.UseInMemoryDatabase(Guid.NewGuid().ToString())
.Options;
var db = new AlexandriaDbContext(options);
var ratingsService = new StarRatingsService(db);
var result = await ratingsService.GetAverageRatingByBookIdAsync(1);
Assert.Equal(0, result);
}