public void When_promotion_applies()
{
var productCatalog = new ProductCatalog();
productCatalog.AddQuantityDiscount("apple", 3, 2);
productCatalog.AddProduct("apple", 0.75m);
var sut = new QuantityDiscountRule(productCatalog);
var promotions = new Promotions(new List<IPromotionalDiscountRule>() { sut });
var lineItem = new LineItem("apple", 7, productCatalog, promotions);
var actual = sut.PromotionApplies(lineItem);
Assert.That(actual, Is.True);
}
