Made two tests green: 1) one coffee with a milk, 2) one coffee with a honey and a milk.
Refactoring - wrote my desired interface of Beverage class with the help of the UML of Decorator pattern.
Created Beverage class.
Moved class Beverage to another file to match its type.
Created class Coffee.
Moved class Coffee to another file to match type name.
Created abstract method Beverage.GetTotalDescription().
Created abstract method Beverage.GetTotalPrice().
Alt-Entered two blank methods in class Coffee.
Implemented the two methods in class Coffee.
Used Beverage class to print bill for OneCoffee.
Changed the display order of two methods.
Wrote desired interface in the client for OrderOneCoffeeWithAMilk.
Created class Milk.
Moved class Milk to another file to match type name.
Implemented the two methods in class Milk using Alt-Enter.
Store the incoming beverage parameter into a member variable of class Milk.
Created a Beverage field in class Milk.
Implemented Milk.GetTotalDescription().
Changed the return type of Beverage.GetTotalPrice() to be int. Changed all prices to be integer.