anchor.diff:      case spawn_and_check(Fun, Num - 1) of
           ok ->
               receive
  -                ok -> ok
  +                ok ->
  +                    ct:print("bbb ~p", [Master]),
  +                    ok
               after ?REQUEST_TIMEOUT ->
  +                ct:print("ccc ~p", [Master]),
                   {error, timeout}
               end;
           E ->
  +            ct:print("ddd ~p", [Master]),
               E
       end.
   
  
positive.code: 
  count_answers(Num, Exp) ->
      Ans = receive
                #worker_answer{id = Num, response = Response} -> Response
            after ?REQUEST_TIMEOUT ->
                {error, timeout}
            end,
      ?assertEqual(pong, Ans),
  
negative.code: 
  spawn_and_check(Fun, Num) ->
      Master = self(),
      ct:print("aaa ~p", [Master]),
      spawn_link(fun() ->
          Fun(),
          Master ! ok
  