Writing tests can seem tedious at first, but they really do help you find problems faster—especially regressions (breaking something that used to work). Painful experience teaches all developers that even the teeniest change, which they swear could not possibly affect anything else, actually does.  

―Introducing Python, Chapter 12

悲しいけどその通り。どれだけ安全と思っているわずかな変更でも大抵バグはある。毎日がバグとの戦いだ。

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