public void It_does_not_give_discount_when_deal_does_not_apply()
{
var items = new Collection <IPurchaseable> {
new Bread(), new Butter()
};
var unit = new CurrentOffers();
var deal = Substitute.For <IDeal>();
deal.TimesEligible(items).Returns(0);
unit.RegisterDeal(deal, 100);
Assert.That(unit.GetApplicable(items).NetPence, Is.EqualTo(0));
}
public void It_gives_discount_when_deal_applies_twice()
{
var items = new Collection <IPurchaseable> {
new Bread(), new Butter()
};
var unit = new CurrentOffers();
var deal = Substitute.For <IDeal>();
var timesApplicable = 2;
deal.TimesEligible(items).Returns(timesApplicable);
var discount = 100;
unit.RegisterDeal(deal, discount);
Assert.That(unit.GetApplicable(items).NetPence, Is.EqualTo(-discount * timesApplicable));
}