anchor.diff:          do_request(
               RestAddress ++ "/groups/" ++ binary_to_list(GID)++ "/users", Headers, get, [], Options
           ),
  -    [Users] = get_body_val([users], Response),
  -    Users.
  +    Val = get_body_val([users], Response),
  +    fetch_value_from_list(Val).
   
   get_user_info_by_group(GID, UID, ReqParams) ->
       {RestAddress, Headers, Options} = ReqParams,
  
positive.code: space_privilege_check(space_add_provider, Users, _GID, SID) ->
      [{_UserId1, UserReqParams1}, {UserId2, UserReqParams2} | _] = Users,
       %% test if user2 lacks space_add_provider privileges
      ?assertMatch(bad, check_status(get_space_support_token(SID, UserReqParams2))),
      set_space_privileges(users, SID, UserId2, [space_add_provider], UserReqParams1),
      ?assertNotMatch(bad, check_status(get_space_support_token(SID, UserReqParams2))),
      clean_space_privileges(SID, UserId2, UserReqParams1);
  space_privilege_check(space_remove_provider, Users, _GID, SID) ->
      [{_UserId1, UserReqParams1}, {UserId2, UserReqParams2} | _] = Users,
  
negative.code: get_space_creation_token_for_user(ReqParams) ->
      {RestAddress, Headers, Options} = ReqParams,
      Response = do_request(RestAddress ++ "/user/spaces/token", Headers, get, [], Options),
      Val = get_body_val([token], Response),
      fetch_value_from_list(Val).
  
  get_space_creation_token_for_group(GID, ReqParams)->
      {RestAddress, Headers, Options} = ReqParams,
      Response = do_request(
          RestAddress ++ "/groups/"++ binary_to_list(GID) ++ "/spaces/token", Headers, get, [], Options
      ),
      Val = get_body_val([token], Response),
      fetch_value_from_list(Val).
  
  get_space_invitation_token(UserType, ID, ReqParams) ->
      {RestAddress, Headers, Options} = ReqParams,
  