* Require it to have a second argument when adding.
* Merge, rather than replace, on second add.
* Make current_theme_supports() work when two arguments are passed.
Adds unit tests.
props nathanrice for initial patch.
see #24932 for trunk.
git-svn-id: https://develop.svn.wordpress.org/trunk@25193 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