The `$screen` parameter in both functions can now accept a single screen ID, `WP_Screen` object, or an array of screen IDs.
Adds tests.
Props coffee2code, iamfriendly, madalinungureanu, mordauk, igmoweb, meloniq, DrewAPicture.
See #15000.
git-svn-id: https://develop.svn.wordpress.org/trunk@34951 602fd350-edb4-49c9-b593-d223f7449a82
wp-tests-config.php can/should reside in the root of a develop checkout. `phpunit` should be run from the root.
see #25088.
git-svn-id: https://develop.svn.wordpress.org/trunk@25165 602fd350-edb4-49c9-b593-d223f7449a82