public void BadArguments()
{
var allReviews = new List <CustomerReview>()
{
};
IProductRaitingCalculator calculator = GetCalculator(allReviews);
Assert.Throws <ArgumentNullException>(() => calculator.GetProductRating(null));
Assert.Equal(0m, calculator.GetProductRating(NonExistentProductId));
}
public void NoRankingsOnReviews()
{
var allReviews = new List <CustomerReview>()
{
new CustomerReview()
{
ProductId = Product1Id
},
new CustomerReview()
{
ProductId = Product1Id
},
new CustomerReview()
{
ProductId = Product1Id
},
new CustomerReview()
{
ProductId = Product2Id
},
new CustomerReview()
{
ProductId = Product2Id
},
new CustomerReview()
{
ProductId = Product2Id
},
new CustomerReview()
{
ProductId = Product2Id
},
new CustomerReview()
{
ProductId = Product2Id
},
new CustomerReview()
{
ProductId = Product2Id
},
new CustomerReview()
{
ProductId = Product3Id
},
};
IProductRaitingCalculator calculator = GetCalculator(allReviews);
Assert.Equal(0m, calculator.GetProductRating(Product1Id));
Assert.Equal(0m, calculator.GetProductRating(Product2Id));
Assert.Equal(0m, calculator.GetProductRating(Product3Id));
}
public void ComplexScenario()
{
var allReviews = new List <CustomerReview>()
{
new CustomerReview()
{
ProductId = Product1Id, Rating = 1
},
new CustomerReview()
{
ProductId = Product1Id, Rating = 2
},
new CustomerReview()
{
ProductId = Product1Id, Rating = 3
},
new CustomerReview()
{
ProductId = Product1Id, Rating = 4
},
new CustomerReview()
{
ProductId = Product1Id, Rating = 5
},
new CustomerReview()
{
ProductId = Product2Id, Rating = 2
},
new CustomerReview()
{
ProductId = Product2Id, Rating = 1
},
new CustomerReview()
{
ProductId = Product3Id, Rating = 2
},
new CustomerReview()
{
ProductId = Product3Id, Rating = 5
},
new CustomerReview()
{
ProductId = Product3Id, Rating = 5
},
};
IProductRaitingCalculator calculator = GetCalculator(allReviews);
Assert.Equal(3m, calculator.GetProductRating(Product1Id));
Assert.Equal(2.25m, calculator.GetProductRating(Product2Id));
Assert.Equal(3.6m, calculator.GetProductRating(Product3Id));
}
public void RankingMinCount()
{
var allReviews = new List <CustomerReview>()
{
new CustomerReview()
{
ProductId = Product1Id, Rating = 1
},
new CustomerReview()
{
ProductId = Product2Id, Rating = 1
},
new CustomerReview()
{
ProductId = Product1Id, Rating = 1
},
};
IProductRaitingCalculator calculator = GetCalculator(allReviews.Take(2).ToList());
Assert.Equal(0m, calculator.GetProductRating(Product1Id));
Assert.Equal(0m, calculator.GetProductRating(Product2Id));
Assert.Equal(0m, calculator.GetProductRating(Product3Id));
calculator = GetCalculator(allReviews);
Assert.Equal(1m, calculator.GetProductRating(Product1Id));
Assert.Equal(0m, calculator.GetProductRating(Product2Id));
Assert.Equal(0m, calculator.GetProductRating(Product3Id));
}
public void CalculateProductRatings(string[] productIds)
{
if (productIds == null)
{
throw new ArgumentNullException(nameof(productIds));
}
SaveProductRatings(productIds.Select(x => new ProductRating()
{
ProductId = x,
Rating = _calculator.GetProductRating(x)
}).ToArray());
}