anchor.diff:      unittest_helper:init_per_suite(Config).
   
   end_per_suite(Config) ->
  +    erlang:erase(?DBSizeKey),
       crypto:stop(),
       _ = unittest_helper:end_per_suite(Config),
       ok.
  
positive.code:     FType = proplists:get_value(ftype, Config),
      OldConf = get_rep_upd_config(Method),
      Conf = lists:keyreplace(rr_max_items, 1, OldConf, {rr_max_items, 500}),    
      [Start, End] = start_sync(Config, 4, 1000, [{fprob, 100}, {ftype, FType}], 
                                1, 0.1, Conf),
      ?assert(sync_degree(Start) < sync_degree(End)).
  
  
negative.code:     EndStat = get_db_status(),
      %clean up
      unittest_helper:stop_ring(),
      {InitDBStat, EndStat}.
  
  -spec print_status(Round::integer(), db_generator:db_status()) -> ok.
  print_status(R, {_, _, M, O}) ->
  