Hi @joachim-n
Might be better put "Allow phpunit.xml file in project root" into its own command
And we can call i something like
ddev phpunit_root

or use some another flag for example --root_conf
What do you think?

I think it's better UX if it's automatic.

I don't think a separate command or a flag makes sense -- you either have it set up with phpunit.xml in the root, or you're using the one in core, and it's like that for your project all the time.

ok. I agree.
in this case, we need changes in documentations too.
Could you please add?

Thanks for the PR @joachim-n - core/phpunit.xml is already used by this project and gitignored, so you're welcome to modify it for your own purposes or run ddev exec phpunit for your own custom flags.