If the error_reporting directive's value is "" then it could lead to escaping mutants

[sanmai]

Not having this defined lead to Notices not being converted into errors on my CI which lead to escaping mutants. When I tried running Infection by setting error_reporting to E_ALL (32767): php -d error_reporting=32767 ./vendor/bin/infection it works as expected.

I will now go and fix my CI env missing php.ini, but this makes me think if this can somehow be prevented by Infection itself? For example by adding a ini setting in Infections generated phpunit.xml that would set error_reporting to E_ALL. @maks-rafalko What do you think?

Originally posted by @martinssipenko in #1659 (comment)

[martinssipenko]

If adding this makes sense I'd be happy to create a Pull request that would implement it.

[sanmai]

That's a great idea! I don't remember it being particularly difficult. You can take this PR for an example: #1630