public void CheckMax()
{
IDiscountCalculator discountCalculator1 = new DiscountCalculator(new Func <ShoppingBasket, DiscountOfProducts>((ShoppingBasket shoppingBasket) => d1));
IDiscountCalculator discountCalculator2 = new DiscountCalculator(new Func <ShoppingBasket, DiscountOfProducts>((ShoppingBasket shoppingBasket) => d2));
IDiscountCalculator discountCalculator3 = discountCalculator1.Max(discountCalculator2);
Assert.AreEqual(20, discountCalculator3.CalcDiscount(shoppingBasket).Discount);
}
public virtual DiscountOfProducts CalcDiscount(ShoppingBasket shoppingBasket)
{
return(discountCalculator.CalcDiscount(shoppingBasket));
}