public void ShouldNotAddImportedTaxesNorSalesTaxes() { //arrange var good = _goods.Where(g => g.Id == 3).FirstOrDefault(); var priceBeforeTaxes = good.Price; //Act _taxCalculator.CalculatePriceWithTaxesGood(good); //Assert Assert.IsFalse(good.Imported); Assert.IsTrue(good.Price == priceBeforeTaxes); }