public void ApplyDiscount_FourMilk_OneFree()
{
var pricedProducts = new[]
{
new PricedProduct(ProductIdentifier.Milk, 1.15m),
new PricedProduct(ProductIdentifier.Milk, 1.15m),
new PricedProduct(ProductIdentifier.Milk, 1.15m),
new PricedProduct(ProductIdentifier.Milk, 1.15m)
};
_offer.Apply(pricedProducts);
Assert.Equal(4, pricedProducts.Length);
Assert.True(pricedProducts.All(p => p.Identifier == ProductIdentifier.Milk));
Assert.Equal(1, pricedProducts.Count(p => p.DiscountedPrice == 0));
Assert.Equal(3, pricedProducts.Count(p => p.DiscountedPrice == 1.15m));
}
public void ApplyDiscount_TwoButters_ApplyDiscountToOneBread()
{
var pricedProducts = new[]
{
new PricedProduct(ProductIdentifier.Butter, 0.8m),
new PricedProduct(ProductIdentifier.Butter, 0.8m),
new PricedProduct(ProductIdentifier.Bread, 1m),
new PricedProduct(ProductIdentifier.Bread, 1m)
};
_offer.Apply(pricedProducts);
Assert.Equal(4, pricedProducts.Length);
Assert.True(pricedProducts.All(p => p.Identifier == ProductIdentifier.Bread || p.Identifier == ProductIdentifier.Butter));
Assert.Equal(1, pricedProducts.Count(p => p.Identifier == ProductIdentifier.Bread && p.DiscountedPrice == 0.5m));
Assert.Equal(1, pricedProducts.Count(p => p.Identifier == ProductIdentifier.Bread && p.DiscountedPrice == 1));
Assert.Equal(2, pricedProducts.Count(p => p.Identifier == ProductIdentifier.Butter && p.DiscountedPrice == 0.8m));
}
