《xUnit Test Patterns》学习笔记6 - Test Double - CoderZh - 博客园



《xUnit Test Patterns》学习笔记6 - Test Double - CoderZh - 博客园

我不知道Test Double翻译成中文是什么,测试替身?Test Double就像是陈龙大哥电影里的替身,起到以假乱真的作用。在单元测试时,使用Test Double减少对被测对象的依赖,使得测试更加单一,同时,让测试案例执行的时间更短,运行更加稳定,同时能对SUT内部的输入输出进行验证,让测试更加彻底深入。但是,Test Double也不是万能的,Test Double不能被过度使用,因为实际交付的产品是使用实际对象的,过度使用Test Double会让测试变得越来越脱离实际。

我感觉,Test Double这玩意比较适合在Java,C#等完全面向对象的语言中使用。并且需要很好的使用依赖注入(Dependency injection)设计。如果被测系统是使用C或C++开发,使用Test Double将是一个非常困难和痛苦的事情。

要理解Test Double,必须非常清楚以下几个东西的关系,本文的重点也是说明一下他们之间的关系。他们分别是:


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