public void Calculate_ReturnsZeroDiscount_WhenNullProductsListIsPassed(string discountName, decimal discountAmount, string[] packageProductNames)
{
//Arrange
var packageDiscount = new PackageDiscountRule(discountName, discountAmount, packageProductNames);
//Act
var appliedDiscount = packageDiscount.Calculate(null);
//Assert
appliedDiscount.Should().Be(0);
}
public void Calculate_ReturnsZeroDiscount_WhenDiscountConditionsAreNotMet(string discountName, decimal discountAmount, string[] packageProductNames)
{
//Arrange
var packageDiscount = new PackageDiscountRule(discountName, discountAmount, packageProductNames);
var productsInTheBasket = GetProducts(packageProductNames.Take(packageProductNames.Length - 1));
//Act
var appliedDiscount = packageDiscount.Calculate(productsInTheBasket);
//Assert
appliedDiscount.Should().Be(0);
}
public void Calculate_ReturnsMultipleDiscounts_WhenDiscountConditionsAreMetMultipleTimes(string discountName, decimal discountAmount, string[] packageProductNames)
{
//Arrange
var packageDiscount = new PackageDiscountRule(discountName, discountAmount, packageProductNames);
var productsInTheBasket = GetProducts(packageProductNames.Concat(packageProductNames));
//Act
var appliedDiscount = packageDiscount.Calculate(productsInTheBasket);
//Assert
appliedDiscount.Should().Be(2 * discountAmount);
}