Whilst looking at
MDL-32443 I noticed that admin/tool/phpunit/cli/init.php is using a relative include using _DIR_.
The coding style doc says: "Our CLI script must not use relative config.php paths."
Looks like you added this Petr: http://docs.moodle.org/dev/index.php?title=Coding_style&diff=28599&oldid=28598
So this is just to explore this issue..