auth/tests/ is being detected by the check implemented in MDLSITE-1972, despite there being no phpunit tests.

Eloy said

well, I can get the list of possible testcases:

grep -lr 'extends PHPUnit_Framework_TestCase' *

and then look for them within the directories.
1 = need to be covered
>1 = more than 1 in the same file
0 = not need to be covered