public void It_applies_to_five_milks_and_a_butter()
{
var items = new Collection <IPurchaseable> {
new Butter(), new Milk(), new Milk(), new Milk(), new Milk(), new Milk()
};
var unit = new MultibuyMilkDeal();
Assert.That(unit.TimesEligible(items), Is.EqualTo(1));
}
public void It_does_not_apply_to_three_milks()
{
var items = new Collection <IPurchaseable> {
new Milk(), new Milk(), new Milk()
};
var unit = new MultibuyMilkDeal();
Assert.That(unit.TimesEligible(items), Is.EqualTo(0));
}