public void PercentOffOrder_Coupon_Should_Have_Code_and_Apply_Method_That_Takes_Order() {
Order order = GetTestOrder();
PercentOffOrderCoupon coupon = new PercentOffOrderCoupon(10);
//this shouldn't fail
coupon.ApplyCoupon(order);
}
public void PercentOffOrder_Coupon_Should_Reduce_Order_SubTotal_By_TenPercent() {
Order order = GetTestOrder();
decimal preSubTotal = order.SubTotal;
decimal postSubTotal = order.SubTotal - order.SubTotal * 0.1M;
PercentOffOrderCoupon coupon = new PercentOffOrderCoupon(10);
coupon.ApplyCoupon(order);
Assert.AreEqual(postSubTotal, order.SubTotal);
}
