public void GivenDiscountType_WhenResolveDiscountRule_ThenReturnsCorrectRuleInstance_3()
{
var factory = new DiscountRuleFactory();
var discountRule = factory.ResolveDiscountRule(DiscountRuleType.Percentage);
Assert.AreEqual(typeof(PercentageRule), discountRule.GetType());
}
private static Basket GetBasketInstance()
{
var discountFactory = new DiscountRuleFactory();
var calculator = new BasketPriceCalculator(discountFactory);
return(new Basket(calculator));
}
public void GivenDiscountType_WhenResolveDiscountRule_ThenReturnsCorrectRuleInstance_2()
{
var factory = new DiscountRuleFactory();
var discountRule = factory.ResolveDiscountRule(DiscountRuleType.BuyManyGetOneFree);
Assert.AreEqual(typeof(BuyManyGetOneFree), discountRule.GetType());
}
public void GivenWrongDiscountType_WhenResolveDiscountRule_ThenThrowsException()
{
Assert.Throws <ArgumentException>(() =>
{
var factory = new DiscountRuleFactory();
factory.ResolveDiscountRule((DiscountRuleType)4);
});
}
public void GivenBasketItem_Percentage_WhenApplyDiscount_ThenItemIsUpdatedCorrectly()
{
var discountFactory = new DiscountRuleFactory();
var calculator = new BasketPriceCalculator(discountFactory);
var item = new BasketItem
{
Quantity = 2,
AfterDiscountPrice = 0,
DiscountParameter = 10,
DiscountRuleType = DiscountRuleType.Percentage,
Product = new Product
{
Price = (decimal)20.10
}
};
calculator.ApplyDiscount(item);
Assert.AreEqual(36.18, item.AfterDiscountPrice);
}
public void GivenBasketItem_Buy2Get1Free_WhenApplyDiscount_ThenItemIsUpdatedCorrectly()
{
var discountFactory = new DiscountRuleFactory();
var calculator = new BasketPriceCalculator(discountFactory);
var item = new BasketItem
{
Quantity = 3,
AfterDiscountPrice = (decimal)10.50,
DiscountRuleType = DiscountRuleType.BuyManyGetOneFree,
DiscountParameter = 3,
Product = new Product
{
Price = (decimal)10.50
}
};
calculator.ApplyDiscount(item);
Assert.AreEqual(21, item.AfterDiscountPrice);
}
public void GivenBasketItems_WhenCalculateTotal_ThenReturnsCorrectTotal()
{
var discountFactory = new DiscountRuleFactory();
var calculator = new BasketPriceCalculator(discountFactory);
var item = new BasketItem
{
Quantity = 2,
AfterDiscountPrice = (decimal)10.50,
DiscountRuleType = DiscountRuleType.BuyManyGetOneFree,
DiscountParameter = 2,
Product = new Product
{
Price = (decimal)10.50
}
};
var items = Enumerable.Repeat(item, 3);
var total = calculator.CalculateTotal(items);
Assert.AreEqual(31.50, total);
}
