public void DiscountPrice_ShouldReturnDiscountPrice_IfPropertiesMatch()
{
// Arrange
var discount = new MultipleItemDiscount("A99", 3, 1.3m);
var items = new[]
{
new Item("A99", 0.5m),
new Item("A99", 0.5m),
new Item("A99", 0.5m)
};
// Act
decimal discountPrice = discount.DiscountedPrice(items);
// Assert
discountPrice.Should().Be(1.3m);
}
public void IsMatch_ShouldReturnTrue_IfItemsPassed_MatchDiscountProperties()
{
// Arrange
var discount = new MultipleItemDiscount("A99", 3, 1.3m);
var items = new[]
{
new Item("A99", 0.5m),
new Item("A99", 0.5m),
new Item("A99", 0.5m)
};
// Act
bool isMatch = discount.IsMatch(items);
// Assert
isMatch.Should().BeTrue();
}
public void ShouldApply_MultipleDiscounts_RegardlessOfScanOrder()
{
// Arrange
var multipleAppleDiscount = new MultipleItemDiscount("A99", 3, 1.3m);
var biscuitDiscount = new MultipleItemDiscount("B15", 2, 0.45m);
// Act
var checkout = new Checkout(new[] { multipleAppleDiscount, biscuitDiscount });
checkout.Scan(_apple);
checkout.Scan(_apple);
checkout.Scan(_biscuits);
checkout.Scan(_apple);
checkout.Scan(_biscuits);
checkout.Scan(_cola);
// Assert
checkout.Total().Should().Be(1.3m + 0.45m + 0.6m);
}
