public void ShouldCalculateDiscounts() { var result = _discountCalculator.CalculateDiscounts(_discounts.Transactions); var expectedSmallDiscount = Constants.ShippingPrices.Small.MondialRelay - Constants.ShippingPrices.Small.LaPoste; Assert.Equal(expectedSmallDiscount, result[1].Discount); Assert.Equal(0, result[6].ShippingPrice); Assert.Null(result[2].Discount); }