csrc/node-v0.10.24/test/internet/test-net-connect-unref.js

// Copyright Joyent, Inc. and other Node contributors.
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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 net = require('net');

var client, killed = false, ended = false;
var TIMEOUT = 10 * 1000

client = net.createConnection(53, '8.8.8.8', function() {
  client.unref();
});

client.on('close', function() {
  ended = true;
});

setTimeout(function() {
  killed = true;
  client.end();
}, TIMEOUT).unref();

process.on('exit', function() {
  assert.strictEqual(killed, false, 'A client should have connected');
  assert.strictEqual(ended, false, 'A client should stay connected');
});