'Verifies PermissionDenied if caller of add_user_to_course_group is not instructor role.'

def test_add_user_to_course_group_permission_denied(self):

    add_users(self.global_admin, CourseInstructorRole(self.course_key), self.creator)
    add_users(self.global_admin, CourseStaffRole(self.course_key), self.creator)
    with self.assertRaises(PermissionDenied):
        add_users(self.staff, CourseStaffRole(self.course_key), self.staff)
