单元测试还给了开发人员勇气重新划分代码，因为测试失败可以立刻告诉开发人员存在错误。
Unit tests also give developers courage to refactor the code, because a test failure tells the developer immediately if something's broken.
单元测试还给了开发人员勇气重新划分代码，因为测试失败可以立刻告诉开发人员存在错误。
Unit tests also give developers courage to refactor the code, because a test failure tells the developer immediately if something's broken.
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