public void CalculateFee(Basket basket)
{
var distinctBooks = basket.Books
.GroupBy(b => b.BookId)
.Select(b => b.First())
.ToList();
var distinctBooksCount = distinctBooks.Count();
distinctBooks.ForEach(b => basket.Books.Remove(basket.Books.First(x => x.BookId == b.BookId)));
basket.Fee += 100 * distinctBooksCount * _DiscountTable[distinctBooksCount];
if (basket.Books.Count > 0)
{
CalculateFee(basket);
}
}
public void CalculateFeeTest_Buy_One_Book1_One_Book2_One_Book3_One_book4_One_book5_Should_Get_Fee_375()
{
PotterShoppingCart target = new PotterShoppingCart();
var basket = new Basket
{
Books = new List<Book>()
{
new Book() { BookId = 1 },
new Book() { BookId = 2 },
new Book() { BookId = 3 },
new Book() { BookId = 4 },
new Book() { BookId = 5 }
}
};
target.CalculateFee(basket);
var expected = 375;
Assert.AreEqual(expected, basket.Fee);
}
public void CalculateFeeTest_Buy_One_Book1_Should_Get_Fee_100()
{
PotterShoppingCart target = new PotterShoppingCart();
var basket = new Basket
{
Books = new List<Book>() { new Book() { BookId = 1 } }
};
target.CalculateFee(basket);
var expected = 100;
Assert.AreEqual(expected, basket.Fee);
}
