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由于测试成本太高，导致以下两个问题：

  • 重构的步子变大，这样可以少测试几次，但步子大了，容易累积错误，修改错误变得困难

  • 更可怕的是步子大了，累积的错误也多，有些错误不容易及时发现，会在某个节点暴雷，如果是提测后上线前还算幸运，但如果是在上线后暴雷，重构的罪过就大了


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