Log in as admin/teacher Navigate to a course Add a role to a user enrolled in the course Disable browser js. Delete role of user when it is back to enrolled user page, the above user should be displayed and role should not be set in filter. Try assign / unassign role with different filter combinations and make sure all works as expected. Enable JS and repeat above steps. FYI: If in JS mode you can't unassign role then MDL-41589 is not integrated and you can avoid testing in JS mode.