public void TestRemoveSpecialOffer()
{
Supermarket.Item item = new Supermarket.Item("Cheese", 5, 4, 18);
Assert.IsTrue(item.HasSpecialOffer());
item.RemoveSpecialOffer();
Assert.IsFalse(item.HasSpecialOffer());
Assert.AreEqual(0, item.GetSpecialOfferMultiple());
Assert.AreEqual(0, item.GetSpecialOfferPrice());
}
public void TestConstructorWithSpecialOffer()
{
Supermarket.Item item = new Supermarket.Item("Bob", 123, 2, 210);
Assert.AreEqual(item.GetSku(), "Bob");
Assert.AreEqual(item.GetPrice(), 123);
Assert.IsTrue(item.HasSpecialOffer());
Assert.AreEqual(item.GetSpecialOfferMultiple(), 2);
Assert.AreEqual(item.GetSpecialOfferPrice(), 210);
}
public void TestConstructorWithoutSpecialOffer()
{
Supermarket.Item item = new Supermarket.Item("Rob", 456);
Assert.AreEqual(item.GetSku(), "Rob");
Assert.AreEqual(item.GetPrice(), 456);
Assert.IsFalse(item.HasSpecialOffer());
Assert.AreEqual(item.GetSpecialOfferMultiple(), 0);
Assert.AreEqual(item.GetSpecialOfferPrice(), 0);
}
public void TestSetValidSpecialOffer()
{
Supermarket.Item item = new Supermarket.Item("Andy", 789);
Assert.IsFalse(item.HasSpecialOffer());
item.SetSpecialOffer(4, 2800);
Assert.IsTrue(item.HasSpecialOffer());
Assert.AreEqual(item.GetSpecialOfferMultiple(), 4);
Assert.AreEqual(item.GetSpecialOfferPrice(), 2800);
}
/**
* Given an item and a number of units, work out the cost.
*/
private double GetSubtotalForItem(Item item, int itemCount)
{
if (!item.HasSpecialOffer())
{
return(item.GetPrice() * itemCount);
}
else
{
int numberOfSpecials = itemCount / item.GetSpecialOfferMultiple();
int numberOfRegulars = itemCount % item.GetSpecialOfferMultiple();
return(numberOfSpecials * item.GetSpecialOfferPrice() +
numberOfRegulars * item.GetPrice());
}
}