The Three Rules/Laws of TDD

1. You are not allowed to write any production code unless it is to make a failing unit test pass.

除非为了使一个失败的unit test通过，否则不允许编写任何产品代码

1. You are not allowed to write any more of a unit test than is sufficient to fail; and compilation failures are failures.

在一个单元测试中只允许编写刚好能够导致失败的内容（编译错误也算失败）

1. You are not allowed to write any more production code than is sufficient to pass the one failing unit test.

只允许编写刚好能够使一个失败的unit test通过的产品代码

中英双语

中文翻译