public void Cannot_calculate_coupon_discount_for_empty_cart_products_list()
{
//setup
var couponDiscount = new CouponDiscount(threshold: 100, discount: 5);
Assert.Throws <ApplicationException>(() =>
couponDiscount.Calculate(cartProducts: null, cartSubtotal: 100));
Assert.Throws <ApplicationException>(() =>
couponDiscount.Calculate(cartProducts: new List <CartProduct>(), cartSubtotal: 100));
}
public void CouponCalculateTestThrows(double price,
double value)
{
var discount = new CouponDiscount(value);
Assert.That(() => discount.Calculate(price), Throws.TypeOf <ArgumentException>());
}
public void Cannot_calculate_coupon_discount_for_invalid_cart_subTotal()
{
//setup
var couponDiscount = new CouponDiscount(threshold: 100, discount: 5);
var cartProduct = new CartProduct(new Product(code: "9501101530002", name: "Cheerios", price: 6.99m));
Assert.Throws <ApplicationException>(() =>
couponDiscount.Calculate(cartProducts: new List <CartProduct>()
{
cartProduct
}, cartSubtotal: 0));
Assert.Throws <ApplicationException>(() =>
couponDiscount.Calculate(cartProducts: new List <CartProduct>()
{
cartProduct
}, cartSubtotal: -100));
}
public void CouponCalculateTest(double price, double value, double result)
{
var discount = new CouponDiscount(value);
Assert.That(() => discount.Calculate(price), Is.EqualTo(result));
}