Start tests for the built-in notification types
Start tests for the built-in notification types

* Only covers EchoHooks::onUserRights right now, more
  patches to follow

Change-Id: Ie93eff0a9a75a4a9816c81d57b7530149a14bb7a

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo