anchor.diff:  
   
   all() -> [
  -    {group, time_mock_parallel_tests},
  -    {group, parallel_tests},
  -    {group, iterate_parallel_tests},
  -    {group, sequential_tests}
  +%%    {group, time_mock_parallel_tests},
  +%%    {group, parallel_tests},
  +    {group, iterate_parallel_tests}
  +%%    {group, sequential_tests}
   ].
   
   -define(ATTEMPTS, 300).
  
positive.code:     oct_background:end_per_suite(),
      dir_stats_test_utils:enable_stats_counting(Config).
  
  init_per_group(Group, Config) when
      Group =:= parallel_tests;
      Group =:= iterate_parallel_tests
  ->
      Config2 = oct_background:update_background_config(Config),
      lfm_proxy:init(Config2, false);
  init_per_group(_Group, Config) ->
      ok = time_test_utils:freeze_time(Config),
      Config2 = oct_background:update_background_config(Config),
  
negative.code:     Opts#{offset => Offset + length(ListedArchives)};
  update_opts(Opts = #{start_index := _}, ListedArchives) ->
      Opts#{start_index => element(1, lists:last(ListedArchives)), offset => 1}.
  
  prepare_archive_iteration_test_environment(Config, ArchiveCount) ->
      [P1Node] = oct_background:get_provider_nodes(krakow),
      UserSessIdP1 = oct_background:get_user_session_id(user1, krakow),
      
      #object{dataset = #dataset_object{
          id = DatasetId,
          archives = ArchiveObjects
      }} = onenv_file_test_utils:create_and_sync_file_tree(user1, ?SPACE,
          #file_spec{dataset = #dataset_spec{archives = ArchiveCount}}),
      
      lists_utils:pforeach(fun(#archive_object{id = ArchiveId, config = Config}) ->
          ?assertMatch({ok, #archive_info{
              state = ?ARCHIVE_PRESERVED,
              config = Config
          }}, opt_archives:get_info(P1Node, UserSessIdP1, ArchiveId), ?ATTEMPTS)
      end, ArchiveObjects),
      
      % sort archives by their indices
      ExpArchiveIdsAndIndices = lists:sort(fun(A1, A2) ->
          A1#archive_object.index =< A2#archive_object.index
      end, ArchiveObjects),
      ExpArchiveIds = [Id || {Id, _} <- ExpArchiveIdsAndIndices],
      [{exp_archive_ids, ExpArchiveIds}, {dataset_id, DatasetId} | Config].
  