TDD三定律

1、You must write a failing unit test before you write production code.
——测试先行

2、You must stop writing that unit test as soon as it fails; and not compiling is failing.
——测试一旦失败，开始写生产代码

3、You must stop writing production code as soon as the currently failing test passes.——老测试一旦通过，返回写新测试

（编辑：李大同）

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