public void CalculateDiscount_ShouldBeZero_ProductPriceLessThanDiscount()
{
var totalPriceForTheProduct = 30;
var discountStrategyMock = new Mock <IDiscountStrategy>();
discountStrategyMock.Setup(x => x.CalculateDiscount(totalPriceForTheProduct)).Returns(-20);
var discount = new DiscountConcrete(discountStrategyMock.Object);
Assert.AreEqual(0, discount.CalculateDiscount(totalPriceForTheProduct));
}
public void CalculateDiscount_ShouldBeBiggerThanZero_ProductPriceGreaterThanDiscount()
{
var totalPriceForTheProduct = 500;
var discountStrategyMock = new Mock <IDiscountStrategy>();
discountStrategyMock.Setup(x => x.CalculateDiscount(totalPriceForTheProduct)).Returns(450);
var discount = new DiscountConcrete(discountStrategyMock.Object);
Assert.Greater(discount.CalculateDiscount(totalPriceForTheProduct), 0);
}