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PIT is generating equivalent mutations

See original GitHub issue

I’ve seen a couple of SURVIVED mutants that are basically equivalent to the original code base.

I don’t have a full example yet, but I’ve seen it happen in lines whose original content is something like return true; and it replaces by an equal mutant return true; which obviously will survive.

Is this a known bug? is there any workaround? If I wanted to help, where should I start looking into?

Thanks, Pedro

Issue Analytics

State:
Created 5 years ago
Comments:9 (9 by maintainers)

Top GitHub Comments

1reaction

hcolescommented, Aug 7, 2018

Ok, that’s fixed in master, will push a release out soon.

Thanks for the report. Most users would not see this as the new mutators are not switched on by default. Please do report any other similar issues - the plan is to replace the existing return vals mutator with the new set in the near future, but as this bug demonstrates there could still be some unexpected problems.

0reactions

pedrorijo91commented, Aug 8, 2018

both return true; and return Optional.empty() false positives have been fixed 😃 once again, thanks a lot for the quick iteration @hcoles