public void Calculate_ReturnsZeroDiscount_WhenNullProductsListIsPassed(string discountName, int priceThreshold, int discountPercentage)
{
//Arrange
var priceThresholdDiscount = new PriceThresholdDiscountRule(discountName, priceThreshold, discountPercentage);
//Act
var appliedDiscount = priceThresholdDiscount.Calculate(null);
//Assert
appliedDiscount.Should().Be(0);
}
public void Calculate_ReturnsZeroDiscount_WhenTotalPriceIsBelowThreshold(string discountName, int priceThreshold, int discountPercentage)
{
//Arrange
var packageDiscount = new PriceThresholdDiscountRule(discountName, priceThreshold, discountPercentage);
var productsInTheBasket = GetProducts(priceThreshold - 1);
//Act
var appliedDiscount = packageDiscount.Calculate(productsInTheBasket);
//Assert
appliedDiscount.Should().Be(0);
}
public void Calculate_ReturnsSingleDiscount_WhenDiscountConditionsAreMetMultipleTimes(string discountName, int priceThreshold, int discountPercentage)
{
//Arrange
var priceThresholdDiscount = new PriceThresholdDiscountRule(discountName, priceThreshold, discountPercentage);
var productsInTheBasket = GetProducts(5 * priceThreshold).ToList();
//Act
var appliedDiscount = priceThresholdDiscount.Calculate(productsInTheBasket);
var productsSum = productsInTheBasket.Sum(m => m.Price);
//Assert
appliedDiscount.Should().Be(-(discountPercentage * productsSum) / 100);
}
