How to create unit test for the following linq query
public int CalculateRating(string hotelID)
var RatingQuery = from a in db.tbl_Reviews
where a.HotelID == hotelID
group a by a.HotelID into g
TotalRating = g.Sum(a => a.Rating)
int totalRating = Convert.ToInt16(RatingQuery.FirstOrDefault().TotalRating);
int totalnoofRating = db.tbl_Reviews.Count(n => n.HotelID == hotelID);
int newrating = (totalRating / totalnoofRating);
Any of the method can be tested against some pre-calculated analysis or based on some possibility.
Here you can have manually calculated rating for one hotel and your test case will call this function and you can Assert the expected result(that you already know) and the actual return value from the function.
Here you can test CalculateRating function as a unit. you can not test only Linq query as it is stores information in private variable.
Although you can access private variable in unit test using private object.
hope this information helps you,
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