anchor.diff:  -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
            terminate/2, code_change/3]).
   
  --record(state, {nodes}).
  +-record(state, {nodes, timer}).
   
   -include_lib("eunit/include/eunit.hrl").
   
  
positive.code:                                   {ns_node_disco_events, NodesOld, NodesNew}),
                   State#state{nodes = NodesNew}
      end.
  
  % -----------------------------------------------------------
  
  
negative.code: -module(ns_node_disco).
  
  -behaviour(gen_server).
  
  -define(PING_FREQ, 60000).
  
  %% API
  -export([start_link/0,
  