public void TestAdditionalHours() { PriceCalculator calculator = new PriceCalculator(); var dateTime = new DateTime(); var bike = new Bike { RentalPriceFirstHour = 10, RentalPriceAdditionalHour = 20, Id = 1 }; var rental = new Rental { BikeId = 1, CustomerId = 1, Id = 1, RentalBegin = dateTime, RentalEnd = dateTime.AddHours(2), Bike = bike }; var costs = calculator.CalculateCosts(rental); Assert.AreEqual(30, costs); }