public void GivenAnnualPremiumWhenAnnualPremiumIsPresentThenReturnCreditCharge() { // Arrange var annualPremium = 50; var premiumCalculator = new PremiumCalculator(); // Act var creditCharge = premiumCalculator.CalculateCreditCharge(annualPremium); // Assert Assert.AreEqual(2.5M, creditCharge); }