anchor.diff:        {timeout, 30, fun readdir_entry_and_clean/0}]}.
   
   readdir_sync_clean_test_() ->
  -    {setup, fun setup_mem_thres/0,
  +    {setup, fun setup_zero_thres/0, fun teardown/1,
  +     [fun readdir_entry_add_clean/0]}.
  +
  +readdir_sync_mem_thres_test_() ->
  +    {setup, fun setup_mem_thres/0, fun teardown/1,
        [fun readdir_entry_mem_thres/0]}.
   
   get_count() ->
  
positive.code:     ?assertEqual(0, Cnt_3),
      ok.
  
  readdir_entry_mem_thres() ->
      leo_nfs_readdir_state_ets_server:add_readdir_entry(?TEST_COOKIE, dummy),
      Cnt_1 = get_count(),
      ?assertEqual(1, Cnt_1),
  
negative.code:     ok.
  
  setup_mem_thres() ->
      leo_nfs_readdir_state_ets_server:start_link(
        [{nfsd_readdir_scan_int, 180},
         {nfsd_readdir_entry_ttl, 0},
         {nfsd_readdir_mem_thres, 320}]),
      ok.
  
  setup_zero_thres() ->
      leo_nfs_readdir_state_ets_server:start_link(
        [{nfsd_readdir_scan_int, 180},
         {nfsd_readdir_entry_ttl, 0},
  