Setup Create a course with students s1 and s2. Create 2 groups in the course g1 and g2 Create an assignment with a due date. User overrides On the assignment's page, open the settings menu and select " User overrides ". Click " Add user override ". Check the due date field. Confirm that its initial value matches the assignment's original due date. Override the due date for s1 with a date 1 day later than the original. Click " Save " Confirm that the user override for s1 gets created. Edit the user override and set a different due date and click " Save " Confirm that the user override for s1 gets successfully updated. Click on the duplicate icon to duplicate the user override. On the user override form, select s2 and select a different due date for the override. Click " Save " Confirm that the user override for s2 gets created. Delete the user override for s2. Confirm that the user override for s2 gets successfully deleted. Group overrides Go back to the assignment and open the settings menu again and select " Group overrides " Click " Add group override ". Check the due date field. Confirm that its initial value matches the assignment's original due date. Override the due date for g1 with a date 2 days later than the original. Click " Save and enter another overide " Confirm that the group override is saved there is no error message displayed. Override the due date for g2 with a date 3 days later than the original. Click " Save " Confirm that the group overrides for g1 and g2 are displayed in the assignment's group overrides page. Move the override for g1 below the override for g2. Confirm that the operation is successful and you don't get an error message. Refresh the page. Confirm that g1 is still below g2. Move back the override for g1 above the override for g2. Confirm that the operation is successful and you don't get an error message. Refresh the page. Confirm that g1 is still above g2. Delete the group override for g1. Confirm that the group override for g1 gets successfully deleted and that you don't see an error message. Assignment deletion Go back to the course page and turn editing on. Delete the assignment. (You might also have to run cron " php admin/cli/cron.php " to process activity deletion) Confirm that you are able to successfully delete the assignment and that you don't see any error message.