group_perm2 = find_obj_in_resp response, 'Link', 'arvados#user'
verify_link group_perm2, 'permission', 'can_read', groups(:all_users).uuid, nil
group_perm2 = find_obj_in_resp response, 'Link', 'arvados#user'
verify_link group_perm2, 'permission', 'can_read', groups(:all_users).uuid, nil