Install a new instance of Moodle Confirm that scheduled tasks are properly created in the database Add a new dummy task (will require a new class, just copy an existing one and change the name) Change the CRON setting of an existing task DEFINITION (in db/tasks.php) (note its existing entry ID in the DB) Customise an existing task's settings (admin tool to customise them) (note its existing entry ID in the DB) Change all the fields, and confirm that it worked Then update that customised task definition (db/tasks.php) with values that differ to the ones you have set Bump version.php (or the version.php belonging to any plugins you may have altered in this test) and upgrade Moodle Make sure that the new task was added, and its next run value is accurate Make sure that the existing task was updated, and its next run value is accurate Make sure that the customised task was NOT updated, and its next run value is accurate