public void Buy2ButtersGet1Bread50Off_ApplyDiscount_ShouldApply_Correctly()
{
List <IBasketItem> basketItems = null;
var rule = new Buy2ButtersGet1Bread50Off();
Assert.AreEqual(0, rule.ApplyDiscount(basketItems));
basketItems = new List <IBasketItem>();
Assert.AreEqual(0, rule.ApplyDiscount(basketItems));
basketItems.Add(new BasketItem(new Product()
{
Name = "Milk", Price = 1.15
}, 1));
Assert.AreEqual(0, rule.ApplyDiscount(basketItems));
basketItems.Add(new BasketItem(new Product()
{
Name = "Bread", Price = 1
}, 1));
Assert.AreEqual(0, rule.ApplyDiscount(basketItems));
basketItems.Add(new BasketItem(new Product()
{
Name = "Butter", Price = 0.8
}, 1));
Assert.AreEqual(0, rule.ApplyDiscount(basketItems));
basketItems[2].Quantity++;
Assert.AreEqual(0.5, rule.ApplyDiscount(basketItems));
}
public void Buy2ButtersGet1Bread50Off_IsApplicable_ShouldReturn_Correctly()
{
List <IBasketItem> basketItems = null;
var rule = new Buy2ButtersGet1Bread50Off();
Assert.IsFalse(rule.IsApplicable(basketItems));
basketItems = new List <IBasketItem>();
Assert.IsFalse(rule.IsApplicable(basketItems));
basketItems.Add(new BasketItem(new Product()
{
Name = "Milk", Price = 1.15
}, 1));
Assert.IsFalse(rule.IsApplicable(basketItems));
basketItems.Add(new BasketItem(new Product()
{
Name = "Bread", Price = 1
}, 1));
Assert.IsFalse(rule.IsApplicable(basketItems));
basketItems.Add(new BasketItem(new Product()
{
Name = "Butter", Price = 0.8
}, 1));
Assert.IsFalse(rule.IsApplicable(basketItems));
basketItems[2].Quantity++;
Assert.IsTrue(rule.IsApplicable(basketItems));
}
