node/test/simple/test-dns.js

// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:

// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var common = require('../common');
var assert = require('assert');

var dns = require('dns');

var existing = dns.getServers();
assert(existing.length);

var goog = [
  '8.8.8.8',
  '8.8.4.4',
];
assert.doesNotThrow(function () { dns.setServers(goog) });
assert.deepEqual(dns.getServers(), goog);
assert.throws(function () { dns.setServers(['foobar']) });
assert.deepEqual(dns.getServers(), goog);

var goog6 = [
  '2001:4860:4860::8888',
  '2001:4860:4860::8844',
];
assert.doesNotThrow(function () { dns.setServers(goog6) });
assert.deepEqual(dns.getServers(), goog6);

goog6.push('4.4.4.4');
dns.setServers(goog6);
assert.deepEqual(dns.getServers(), goog6);

var ports = [
  '4.4.4.4:53',
  '[2001:4860:4860::8888]:53',
];
var portsExpected = [
  '4.4.4.4',
  '2001:4860:4860::8888',
];
dns.setServers(ports);
assert.deepEqual(dns.getServers(), portsExpected);

assert.doesNotThrow(function () { dns.setServers([]); });
assert.deepEqual(dns.getServers(), []);

assert.throws(
  function() {
    dns.resolve('test.com', [], new Function);
  },
  function(err) {
    return !(err instanceof TypeError);
  },
  "Unexpected error"
);