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2016 java-sig-mutation-testing

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2016 java-sig-mutation-testing

  1. 1. Intro to Mutation Testing slideshare.net/boyarsky Twitter @jeanneboyarsky Blog: http://www.selikoff.net Jeanne Boyarsky NY Java SIG 12/5/16
  2. 2. @jeanneboyarsky Pause for a Commercial
  3. 3. Why write tests? @jeanneboyarsky It used to work!
  4. 4. How know if tests are good? @jeanneboyarsky
  5. 5. If test coverage low @jeanneboyarsky Write more tests! Not ready for mutation testing of class
  6. 6. If test coverage high @jeanneboyarsky All done! Perfect code!
  7. 7. Or is it?Why is it saying nobody is registered?
  8. 8. Code Review!
  9. 9. That’s a mutant!
  10. 10. Too many mutants! They’re everywhere!
  11. 11. PitClipse to the rescue!
  12. 12. Easy to run
  13. 13. The console flies by
  14. 14. We caught 5 mutants
  15. 15. More detail
  16. 16. The mutants live….
  17. 17. Level up
  18. 18. Now 32 survived
  19. 19. Demo
  20. 20. Tips • JUnit tests must pass • Watch console to see if still running • Reports on whole project • Fixing one may take care of more @jeanneboyarsky

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