node/test/simple/test-net-dns-lookup.js

// Copyright Joyent, Inc. and other Node contributors.
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//
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var common = require('../common');
var assert = require('assert');
var net = require('net');
var ok = false;

var server = net.createServer(function(client) {
  client.end();
  server.close();
});

server.listen(common.PORT, '127.0.0.1', function() {
  net.connect(common.PORT, '127.0.0.1').on('lookup', function(err, ip, type) {
    assert.equal(err, null);
    assert.equal(ip, '127.0.0.1');
    assert.equal(type, '4');
    ok = true;
  });
});

process.on('exit', function() {
  assert(ok);
});