test case files matching the suffix "Test.php".
&$paths: list of test cases and directories to search.
-'UnknownAction': An unknown "action" has occurred (useful for defining your own
-actions).
+'UnknownAction': DEPRECATED! To add an action in an extension,
+create a subclass of Action, and add a new key to $wgActions.
+An unknown "action" has occurred (useful for defining your own actions).
$action: action name
$article: article "acted on"