Run Your Tests ALL THE TIME

• fastest way to find bugs
  • more often you run your tests...
  • the less code has changed since the last good version
  • the less code could have caused the bug

• run your tests right after you make a change
  • any change can introduce a new bug, even a documentation change
  • Classic mistake: forgetting a =cut in POD

• any time you don't know what to do next, run your tests

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