Plugins can use `pre_option_widget_{$id_base}` filters to return `ArrayIterator`/`ArrayObject` instances instead of primitive arrays. This makes possible for widget instance data to be drawn from somewhere else than `wp_options`, such as a custom post type.
Add unit tests for widgets.
Fixes#32474.
git-svn-id: https://develop.svn.wordpress.org/trunk@32602 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