public void ServiceTaxTest() { var serviceTax = 12.5; Func <double, double> lambda = SuperMarket.CalculateServiceTax(serviceTax); var totalWithServiceTax = lambda(1500); Assert.That(totalWithServiceTax, Is.EqualTo(1687.5)); }
public void GivenALisOfItemHolds_WhenCalculateTotalCostCalled_ThenReturnsTotalCostWithSeviceTaxApplied() { // Arrange var items = new List <ItemHolder>() { new ItemHolder("1", 10, 50), new ItemHolder("2", 1, 500), new ItemHolder("3", 5, 100) }; Func <List <ItemHolder>, double> totalCalculator = SuperMarket.CalculateTotalCost; var costCalculator = totalCalculator.AndThen(SuperMarket.CalculateServiceTax(12.5)); // Act var totalCost = costCalculator(items); // Assert Assert.That(totalCost, Is.EqualTo(1687.5)); }