Introduction to Mutation Testing using PitClipse and JUnit.

1. Intro to Mutation Testing
slideshare.net/boyarsky
Twitter @jeanneboyarsky
Blog: http://www.selikoff.net
Jeanne Boyarsky
NY Java SIG
12/5/16

2. @jeanneboyarsky
Pause for a Commercial

3. Why write tests?
@jeanneboyarsky
It used
to work!

4. How know if tests are good?
@jeanneboyarsky

5. If test coverage low
@jeanneboyarsky
Write more tests!
Not ready
for mutation
testing of class

6. If test coverage high
@jeanneboyarsky
All done!
Perfect
code!

7. Or is it?Why is it
saying
nobody is
registered?

8. Code Review!

9. That’s a mutant!

10. Too many mutants!
They’re
everywhere!

11. PitClipse to the rescue!

12. Easy to run

13. The console flies by

14. We caught 5 mutants

15. More detail

16. The mutants live….

17. Level up

18. Now 32 survived

19. Demo

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