Step 1: Run unit tests. Step 2: Attempt to reproduce with memcache. Set up as required for php+memcache Log in as an admin Browse to cache config Create a new memcache store Edit the stores used when no mapping is present Set the application cache to your newly created memcache store. Save changes Browse to the course category management interface. Add a top level category Check the following: When the page loads after adding the category you immediately see the category. Find the eventinvalidation cache stats box and check you see cachestore_file in there. Repeat with memcached Step 3: Attempt to delete a course. Set up as required for php+memcache Log in as an admin Browse to cache config Create a new memcache store Edit the stores used when no mapping is present Set the application cache to your newly created memcache store. Save changes Browse to the course category management interface. Add a course Browse back to the course category management interface and to the category you added the course to. Check that you see the course. Delete the course. Check when the deletion is complete that you don't see the course in the management interface and that you didn't get any errors. Step 4: Test install and upgrade. Upgrade a 2.5 site to 2.6/master Perform a fresh install