public void CalculateTotal_NoItems_ReturnsZero()
{
var checkout = new Checkout(null);
var total = checkout.CalculateTotal();
total.Should().Be(0);
}
public void CalculateTotal_OneItem_ReturnsItemsValue()
{
var prices = GetPrices();
var checkout = new Checkout(prices);
checkout.Scan("A");
var total = checkout.CalculateTotal();
total.Should().Be(50);
}
public void CalulateTotal_ItemsThatDontQualifyForOffer_ShouldBeSummed()
{
var prices = GetPrices();
var checkout = new Checkout(prices);
checkout.Scan("A");
checkout.Scan("A");
var total = checkout.CalculateTotal();
total.Should().Be(100);
}
public void CalculateTotal_TwoItems_ReturnsSumOfTwoItems()
{
var prices = GetPrices();
var checkout = new Checkout(prices);
checkout.Scan("A");
checkout.Scan("B");
var total = checkout.CalculateTotal();
total.Should().Be(80);
}
public void CalulateTotal_ItemsThatQualifyForOfferOfDifferentKinds_OfferShouldBeAppliedToBoth()
{
var prices = GetPrices();
var checkout = new Checkout(prices);
checkout.Scan("A");
checkout.Scan("A");
checkout.Scan("A");
checkout.Scan("B");
checkout.Scan("B");
var total = checkout.CalculateTotal();
total.Should().Be(175);
}
public void CalulateTotal_OneItemFromEachProduct_ReturnsSum()
{
var prices = GetPrices();
var checkout = new Checkout(prices);
checkout.Scan("C");
checkout.Scan("D");
checkout.Scan("B");
checkout.Scan("A");
var total = checkout.CalculateTotal();
total.Should().Be(115);
}
