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Command Pattern Testing

Understand high-level programming concepts (such as inheritance, encapsulation, data abstraction, and polymorphism) and how they are implemented. 

Level 2 Programming theory

In this tutorial, you will learn how to test the Command Pattern

Expose only the important details of an object by correctly recognizing opportunities to implement abstraction

Control access to data within a class by applying encapsulation with getters and setters

Explain the purpose of interfaces, including their functional usability advantages over standard classes  