public async Task UpdateReviewScoreUpdatingReview_WhenParametersAreCorrect()
{
// Arrange
const int reviewID = 1;
const double rating = 5;
var movieRepoStub = new Mock <IRepository <Movie> >();
var reviewRepoMock = new Mock <IRepository <Review> >();
var reviewRatingsStub = new Mock <IRepository <ReviewRatings> >();
var user = new User()
{
Id = "1", UserName = "******"
};
var movie = new Movie()
{
Name = "Mecho Puh"
};
var reviewRating = new ReviewRatings()
{
ID = 1, ReviewId = 1, UserId = "1", ReviewRating = 6
}; //thats gonna change to 5
var reviewRating2 = new ReviewRatings()
{
ID = 2, ReviewId = 1, UserId = "2", ReviewRating = 4
};
var reviewMock = new Review()
{
ID = 1, IsDeleted = false, Text = "Text", Movie = movie, User = user, UserID = user.Id, MovieID = movie.ID, ReviewRatings = new List <ReviewRatings>()
{
reviewRating, reviewRating2
}, NumberOfVotes = 2, MovieRating = 9.95, ReviewScore = 5
}; //The review score is 5 = (6 + 4)/ 2
var allReviews = new List <Review>()
{
reviewMock
}.AsQueryable().BuildMock().Object;
reviewRepoMock.Setup(m => m.All()).Returns(allReviews);
var reviewServices = new ReviewsService(reviewRepoMock.Object, movieRepoStub.Object, reviewRatingsStub.Object);
// Act
var result = await reviewServices.RateReviewAsync(reviewID, rating, "1");
// Assert
reviewRepoMock.Verify(revRepo => revRepo.SaveAsync(), Times.Once);
reviewRepoMock.Verify(revRepo => revRepo.Update(reviewMock), Times.Once);
Assert.AreSame(result, reviewMock);
Assert.IsTrue(reviewMock.ReviewScore == 4.5); //the rating for userID 1 has changed from 6 to 5, hence now the score should be (4 + 5) / 2 = 4.5
}
public async Task <Review> RateReviewAsync(int reviewID, double rating, string currentUserId)
{
Validator.IfIsNotPositive(reviewID, "ReviewID cannot be negative or 0.");
Validator.IfIsNotInRangeInclusive(rating, 0D, 10D, "Score is in incorrect range.");
var foundReview = await reviewRepo.All()
.Where(rev => rev.ID == reviewID && rev.IsDeleted == false)
.Include(r => r.User)
.Include(r => r.Movie)
.Include(r => r.ReviewRatings)
.FirstOrDefaultAsync();
if (foundReview is null)
{
throw new ReviewNotFoundException($"Review with ID: {reviewID} not found.");
}
// Check logic!!!
var reviewRatingToUpdate = foundReview.ReviewRatings
.FirstOrDefault(r => r.UserId == currentUserId &&
r.ReviewId == foundReview.ID);
if (reviewRatingToUpdate is null)
{
var reviewRatingToAdd = new ReviewRatings()
{
ReviewId = foundReview.ID,
UserId = currentUserId,
ReviewRating = rating,
};
foundReview.NumberOfVotes++;
foundReview.ReviewScore += (rating - foundReview.ReviewScore) / foundReview.NumberOfVotes;
foundReview.ReviewRatings.Add(reviewRatingToAdd);
}
else
{
if (foundReview.NumberOfVotes == 1)
{
foundReview.ReviewScore = rating;
}
else
{
if (foundReview.NumberOfVotes == 0)
{
foundReview.ReviewScore = 0;
}
else
{
foundReview.ReviewScore = ((foundReview.ReviewScore * foundReview.NumberOfVotes) - reviewRatingToUpdate.ReviewRating) / (foundReview.NumberOfVotes - 1);
}
foundReview.ReviewScore += (rating - foundReview.ReviewScore) / foundReview.NumberOfVotes;
}
reviewRatingToUpdate.ReviewRating = rating;
}
reviewRepo.Update(foundReview);
await reviewRepo.SaveAsync();
return(foundReview);
}
