[gbog]

I would call code coverage "good" when I trust that:

- When I change the logic of a statement somewhere in the code, at least one test will fail in the suite.

A high % in a test report may give an indication but is far from giving me confidence. Having good code coverage means that, once you are back to green, and you have done to test code what will keep or improve your code coverage confidence, you can send the PR being tranquil that you didn't break anything else.