node/test/simple/test-dgram-empty-packet.js

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//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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var common = require('../common');
var assert = require('assert');

var fs = require('fs');
var dgram = require('dgram');
var callbacks = 0;
var client;
var timer;


client = dgram.createSocket('udp4');

client.bind(common.PORT);

function callback() {
  callbacks++;
  if (callbacks == 2) {
    clearTimeout(timer);
    client.close();
  } else if (callbacks > 2) {
    throw new Error("the callbacks should be called only two times");
  }
}

client.on('message', function (buffer, bytes) {
  callback();
});

client.send(new Buffer(1), 0, 0, common.PORT, "127.0.0.1", function (err, len) {
  callback();
});

timer = setTimeout(function() {
  throw new Error('Timeout');
}, 200);