thinkinglabs / the-100percent-code-coverage-fallacy Goto Github PK

It seems the building has stopped on travis-ci.org since June 15th 2021.
We should replace this with GitHub Actions and find a way to have a similar build badge.

Hello !

I have some questions on the test coverage combined with mutations.

Based on the readme :

Inside that organisation, having 30% test coverage was a big achievement, as most teams had no or very little test coverage. You can imagine the team was very proud. Until the day someone had the clever idea to run mutation tests against the code base. All of a sudden the test coverage dropped to 3%.

How the new coverage is calculated with the mutation tests ?

For example if pitest return 100% coverage on lines and 80%~ on mutations does that means that my coverage is 80% ?
Or I have to calculate the lines covered and exclude all remaining mutations to have the real coverage ?

Thanks you for your work 👍