anchor.diff:  
   groups() -> 
       [
  -     {inet_backend_default, [], inet_backend_default_cases()},
  -     {inet_backend_inet,    [], inet_backend_inet_cases()},
  -     {inet_backend_socket,  [], inet_backend_socket_cases()}
  +     {inet_backend_default,   [], inet_backend_default_cases()},
  +     {inet_backend_inet,      [], inet_backend_inet_cases()},
  +     {inet_backend_socket,    [], inet_backend_socket_cases()},
  +
  +     {ctrl_proc,              [], ctrl_proc_cases()},
  +     {close,                  [], close_cases()},
  +     {active,                 [], active_cases()},
  +     {shutdown,               [], shutdown_cases()},
  +     {econnreset,             [], econnreset_cases()},
  +     {linger_zero,            [], linger_zero_cases()},
  +     {busy_disconnect,        [], busy_disconnect_cases()},
  +     {partial_recv_and_close, [], partial_recv_and_close_cases()},
  +     {pktoptions,             [], pktoptions_cases()},
  +     {accept,                 [], accept_cases()},
  +     {send_timeout,           [], send_timeout_cases()}
       ].
   
   inet_backend_default_cases() ->
  
positive.code:      bidirectional_traffic
      ].
  
  
  init_per_suite(Config0) ->
  
  
negative.code: 
  all_cases() ->
      [
       {group, ctrl_proc},
       iter_max_socks,
       {group, close},
       {group, active},
       {group, shutdown},
       {group, econnreset},
       {group, linger_zero},
       default_options, http_bad_packet, busy_send,
       {group, busy_disconnect},
       fill_sendq,
       {group, partial_recv_and_close},
       so_priority,
       {group, pktoptions},
       {group, accept},
       {group, send_timeout},
       otp_7731,
       wrapping_oct,
       zombie_sockets,
  