public void UpdateTotalWithNoItems()
{
var expected = 0M;
var result = CheckoutHelpers.UpdateTotal(0, 0.25M);
Assert.Equal(result, expected);
}
[InlineData(3)] //3 Oranges @ £0.60 = £1.20
public void UpdateTotalWithThreeForTwoTheory(int quantity)
{
var expected = 1.20M;
var result = CheckoutHelpers.UpdateTotal(quantity, 0.60M, Discounts.BuyThreeForTwo);
Assert.Equal(result, expected);
}
public void UpdateTotalWithThreeForTwo()
{
var expected = 2.40M; //6 Oranges @ £0.60 = £2.40
var result = CheckoutHelpers.UpdateTotal(6, 0.60M, Discounts.BuyThreeForTwo);
Assert.Equal(result, expected);
}
[InlineData(2)] //2 Apples @ £0.25 = £0.25
public void UpdateTotalWithBuyOneGetOneFreeDiscountTheory(int quantity)
{
var expected = 0.25M;
var result = CheckoutHelpers.UpdateTotal(quantity, 0.25M, Discounts.BuyOneGetOneFree);
Assert.Equal(result, expected);
}
public void UpdateTotalWithBuyOneGetOneFreeDiscount()
{
var expected = 1M; //8 Apples @ £0.25
var result = CheckoutHelpers.UpdateTotal(8, 0.25M, Discounts.BuyOneGetOneFree);
Assert.Equal(result, expected);
}
public void UpdateTotalWithNegativeQuantity()
{
Assert.Throws <ArgumentOutOfRangeException>(() => CheckoutHelpers.UpdateTotal(-5, 0.25M));
}
