Google Mock的设计灵感来源于jMock和EasyMock，它的作用是帮你快速地做出一个接口的仿制品。如果你的设计依赖其它的类，而这些类还没有完成或非常昂贵（如数据库）；如果你要测试你的模块与其它模块是否能正确结合，并想了解其交互过程；那么Google Mock就能帮助你。
Google C Mocking Framework (or Google Mock for short) is a library for writing and using C mock classes. It was inspired by jMock, EasyMock, and Hamcrest, and designed with C++’s specifics in mind. It lets you create mock classes trivially using simple macros, supports a rich set of matchers and actions, handles unordered, partially ordered, or completely ordered expectations, and is extensible by users.
