Unit Test的三A原则: Arrange, Act, Assert - Arrange any input data and processing classes needed for the test - Perform the action under test - Test the results with one or more asserts. Yes, it can be more than one assert, so long as they all work to test the action that was performed.
- Unit tests have one assert per test.
- Avoid if-statements in a unit test.
- Unit tests only “new()” the unit under test.
- Unit tests do not contain hard-coded values unless they have a specific meaning.
- Unit tests are stateless.
不是Unit Test - It talks to the database - It communicates across the network - It touches the file system - It can’t run at the same time as any of your other unit tests - You have to do special things to your environment (such as editing config files) to run it.
目前在世界顶尖的软件咨询公司从事敏捷方法/极限编程、测试驱动开发、重构、面向对象设计、Java、C#和C++等方面的培训和项目指导。他是著名测试框架CppUnit和FitCpp的开发者，已经主持了三次面向对象界盛会OOPSLA上的CodeFest比赛。他还是《修改代码的艺术》（Working Effectively with Legacy Code）一书的作者。
Michael Feathers is the founder and Director of R7K Research & Conveyance, a company specializing in software and organization design. Michael is also the author of the book Working Effectively with Legacy Code (Prentice Hall, 2004).
- 在yc news上的讨论
- 在reddit上的讨论 8个板块都有讨论
- twitter上Michael Feathers的回复 引用了08年自己的一篇文章The Flawed Theory Behind Unit Testing
- Henrik Warne在个人博客上的response，跟Coplien在评论区又讨论了很多。
Uncle Bob and Jim Coplien’s debate on TDD提到更早之前(2008年2月)，Cope大老讨论Coplien and Martin Debate TDD, CDD and Professionalism另外一位Uncle Bob
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Bob Martin is an Agile Manifesto author, and author of books on Agile Programming, XP, UML, O-O Programming, and C++. He is CEO and president of Object Mentor www.objectmentor.com/ Jim Coplien is a software pioneer in o-o programming and C++ and multi-paradigm design. He appreciates the human side of design, and has written critically acclaimed books on design and development.