We are mostly testing the new functionality in 2.3, but part of that is testing that data is upgraded and restored properly from 2.2. 1. With default settings, go to any course and ensure you can add any type of activity. 2. Change the role definition for the Teacher role, to remove mod/chat:addinstance, and make sure you cannot add a Chat in any course when logged in as a Teacher. 3. Using a Moodle 2.2 site, turn on the Module security feature, and set it to restrict modules for all courses, with a default list. (Using the old http://docs.moodle.org/22/en/Managing_activities#Module_security feature) 4. Go into a course in this site, go to the course settings, make sure module security is turned on there, and that the list of allowed modules is right, then Save the form. 5. Backup this course, and restore it into your Moodle 2.3 dev install. Verify that role overrides are created to prevent Teachers from adding the disallowed modules. 6. As for steps 4. and 5. but set things up on, and backup and restore from, a Moodle 1.9 site. 7. Upgrade the Moodle 2.2 site that you used in steps 4. and 5. to the latest master. Verify that the correct role overrides are created; and that the old course_allowed_modules table, and course.retrictmodules column and restrictmodulesfor, restrictbydefault and defaultallowedmodules config settings are dropped.) 8. Test a fresh install just to be sure