Testing difficulty: Medium/Hard (requires 1.9 installation and checking values in the DB) Prepare a Moodle 1.9 site with the Workshop module enabled Create a workshop instance Submit some submissions with attachments into the workshop. (Hint: choose names of the attachments in a way that will allow you to match it with the submission later). Delete some submissions and submit some more again - we need non-linear ids in the workshop submissions table. (If unable to delete submissions, use multiple instances of workshops and then delete some instance. Make sure there are "holes" in the sequence of the ids in the workshop submissions table). Upgrade the site to 2.2 or 2.1 (or eventually 2.0 if integrators decide to backport this there, too). TEST: Make sure that after the upgrade, the attachments submissions are all present and they match the submissions.