public void TestSpeedyDelivery()
{
ShippingCostCalculator calculator = new ShippingCostCalculator(new SpeedyShippingCalculator());
double price = calculator.Calculate(Order);
Assert.AreEqual(price, 60);
}
public void TestRegularDelivery()
{
ShippingCostCalculator calculator = new ShippingCostCalculator(new RegularShippingCalculator());
double price = calculator.Calculate(Order);
Assert.AreEqual(price, 35);
}