public void When_Buy1Book_Expect_ItsPrice()
{
IBasketCalculator calc = new InfrastructureLayer.BasketCalculators.BasketCalcTechRule();
decimal price = calc.CalculateCatalogPrice(new List <Catalog>()
{
Book1
});
Assert.AreEqual(price, Book1.Price);
}
public void When_BuyBooksInSameGroup_Expect_DiscountForTheFirstOnly()
{
IBasketCalculator calc = new InfrastructureLayer.BasketCalculators.BasketCalcTechRule();
decimal price = calc.CalculateCatalogPrice(new List <Catalog>()
{
Book1, Book1, Book1,
Book2, Book2
});
Assert.AreEqual(Book1.Price * 3 + Book2.Price * (1 - Book2.Category.Discount) + Book2.Price, price);
}
public void When_BuyMoreThanAvaliableBooks_Expect_Exception()
{
IBasketCalculator calc = new InfrastructureLayer.BasketCalculators.BasketCalcTechRule();
NotEnoughInventoryException exception = Assert.Throws <NotEnoughInventoryException>(() => calc.CalculateCatalogPrice(new List <Catalog>()
{
Book2, Book2, Book2
}));
Assert.AreEqual(Book2.Name, exception.Missing.First().Name);
Assert.AreEqual(Book2.Quantity, exception.Missing.First().Quantity);
}
public void When_BuyNullBooks_Expect_Exception()
{
IBasketCalculator calc = new InfrastructureLayer.BasketCalculators.BasketCalcTechRule();
Assert.Throws <ArgumentOutOfRangeException>(() => calc.CalculateCatalogPrice(null));
}