anchor.diff:           %% *** Init part ***
            #{desc => "await start",
              cmd  => fun(State) ->
  -                           receive
  -                               {start, Tester} ->
  -                                   {ok, State#{tester => Tester}}
  -                           end
  +                           Tester = ev_await_start(),
  +                           {ok, State#{tester => Tester}}
                      end},
            #{desc => "monitor tester",
              cmd  => fun(#{tester := Tester} = _State) ->
  
positive.code:                 {error, _} = ERROR ->
                      ERROR
              end
      end.
  
  ev_await_check_down(DownPid, DownReason, Pids) ->
  
negative.code:                            end
                     end},
           #{desc => "bind to local address",
             cmd  => fun(#{lsock := LSock, local_sa := LSA} = State) ->
                             case socket:bind(LSock, LSA) of
                                 {ok, Port} ->
                                     {ok, State#{lport => Port}};
  