anchor.diff:  %%               {213,159},
   %%               {373,173},
   %%               {376,118}]}
  -%%     8> F(8, 1024).
  +%%     8> send_one_from_many(8, 1024).
   %%     {21001891,[{20999968,128},
   %%                {8997891,172},
   %%                {8997927,91},
  
positive.code: %% open/1
  
  open(Opts) ->
      gen_sctp:open([{ip, ?ADDR}, {port, 0}, {active, true}, binary,
                     {recbuf, 1 bsl 16}, {sndbuf, 1 bsl 16}
                     | Opts]).
  
  %% assoc/1
  
  assoc(Sock) ->
      receive
          ?SCTP(Sock, {_, #sctp_assoc_change{state = S,
                                             assoc_id = Id}}) ->
              comm_up = S,  %% assert
              Id
      end.
  
negative.code:     [{timetrap, {seconds, 10}}].
  
  all() ->
      [send_one_from_many,
       send_many_from_one,
       receive_what_was_sent].
  
  init_per_suite(Config) ->
  