Transcript
Intro to Mutation Testing
slideshare.net/boyarskyTwitter @jeanneboyarskyBlog: http://www.selikoff.net
Jeanne BoyarskyNY Java SIG
12/5/16
@jeanneboyarsky
Pause for a Commercial
Why write tests?
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It used to work!
How know if tests are good?
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If test coverage low
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Write more tests!
Not ready for mutation testing of class
If test coverage high
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All done!Perfect code!
Or is it?Why is it saying
nobody is registered?
Code Review!
That’s a mutant!
Too many mutants!They’re
everywhere!
PitClipse to the rescue!
Easy to run
The console flies by
We caught 5 mutants
More detail
The mutants live….
Level up
Now 32 survived
Demo
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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