public void DecoratorPatternTest()
{
Beverage beverage = new Espresso(price: 2, description: nameof(Espresso));
Mocha mocha = new Mocha(beverage, 1, nameof(Mocha));
Assert.AreEqual(mocha.Cost(), 3);
Assert.AreEqual(mocha.Description, "Espresso, Mocha");
}
