anchor.diff:  % which belongs to another group. The structure looks as follows:
   % User -> G1 -> G2 -> G3
   create_3_nested_groups(Config, TestUser) ->
  -    {ok, BottomGroup} = oz_test_utils:create_group(Config, TestUser, <<"gr">>),
  +    create_3_nested_groups(Config, TestUser, <<"gr">>, <<"gr">>, <<"gr">>).
  +create_3_nested_groups(Config, TestUser, BotGrName, MidGrName, TopGrName) ->
  +    {ok, BottomGroup} = oz_test_utils:create_group(
  +        Config, TestUser, BotGrName
  +    ),
       % Dummy user will be used only to create groups
       {ok, DummyUser} = oz_test_utils:create_user(Config, #od_user{}),
  -    {ok, MiddleGroup} = oz_test_utils:create_group(Config, DummyUser, <<"gr">>),
  -    {ok, TopGroup} = oz_test_utils:create_group(Config, DummyUser, <<"gr">>),
  +    {ok, MiddleGroup} = oz_test_utils:create_group(
  +        Config, DummyUser, MidGrName
  +    ),
  +    {ok, TopGroup} = oz_test_utils:create_group(
  +        Config, DummyUser, TopGrName
  +    ),
       {ok, MiddleGroup} = oz_test_utils:join_group(
           Config, {group, BottomGroup}, MiddleGroup
       ),
       {ok, TopGroup} = oz_test_utils:join_group(
           Config, {group, MiddleGroup}, TopGroup
       ),
  -    TopGroup.
  +    {BottomGroup, MiddleGroup, TopGroup}.
   
   %%%===================================================================
   %%% Setup/teardown functions
  
positive.code: 
      % Add him to a nested group, which belongs to a group, which belongs to a
      % group that has the privileges and check if he can list users of provider.
      TopGroup = create_3_nested_groups(Config, TestUser),
      % The user should still not be able to list users of provider as the group
      % does not have privileges.
      ?assert(check_list_users_of_provider(403, TestUser, Provider, undefined)),
  
negative.code:         Config, {user, User2}, <<"sp">>
      ),
      % User 3 belongs to space 3 by nested groups
      {_, _, ParentGroup} = create_3_nested_groups(Config, User3),
      {ok, Space3} = oz_test_utils:add_member_to_space(
          Config, {group, ParentGroup}, Space3
      ),
  