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);
}
public void When_calculating_rule()
{
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.Calculate(lineItem);
Assert.That(actual.DiscountedSubTotal, Is.EqualTo(4.75m));
Assert.That(actual.DiscountNote, Is.EqualTo("***Discount on apple: Buy 3 apple for $2.00, New Price $4.75, Savings $0.50"));
}
