public void Bridge_GivenAProductAndANationalTax_CalculateTax_ReturnTax() { var tax = new OnePercentTax(); var netCostOfCheese = 10; var cheese = new Cheese(netCostOfCheese, tax); var actualCost = cheese.CalculateTax(); var expectedCost = netCostOfCheese / 100m; IsNotNull(actualCost); IsTrue(actualCost > 0m); AreEqual(expectedCost, actualCost); }