Unit tests: Follow rule number 1 - always call parent::tearDown()
Squashed 'tests/phpunit/includes/uninstall/' changes from 7444127..a9a0ce2

a9a0ce2 Back-compat for 7444127bf6eeb63f6f2fbb86a4bbf85dcfd5945c

git-subtree-dir: tests/phpunit/includes/uninstall
git-subtree-split: a9a0ce29e521fb4e483bcdaf8262be6b510ae5da
Fix our failing build. Merge commit '94ed5f91921771a0393401b95f70d3fe4985752b'