Why fix bugs with unit tests?

I know this is nothing new, but I will share my perspective anyway:

How I fix bugs with unit tests:

  1. Write a unit test that reproduces the bug so the test fails
  2. Fix the bug so the unit test passes
  3. Send a link with both to the bug submitter

Why I like it:

  • Saves time debugging – just run the unit test instead of recreating the bug scenario every time
  • Creates a simple yes/no criteria to verify whether the bug is fixed
  • Regression can be detected quickly in the future
  • Better communication: bug is documented for other developers looking at this code
  • If you don’t have time to fix the bug immediately, write a failing test.  Then you or someone else can fix the bug later
  • An organic way to increase code coverage for existing code

2 thoughts on “Why fix bugs with unit tests?”

  1. Why unit tests specifically? Surely there will be cases where another type of test would be more appropriate.

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