`WP_UnitTestCase::tearDown()` restores the test environment to the default
conditions, including rolling back the MySQL transaction that the test takes
place in, resetting globals, and unhooking test-specific filters. As such, all
teardown routines for specific tests should happen before the parent class's
`tearDown()` method is called. Failure to do so can cause database locks on
certain configurations, among other problems.
See #31537.
git-svn-id: https://develop.svn.wordpress.org/trunk@31622 602fd350-edb4-49c9-b593-d223f7449a82
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