node/test/simple/test-c-ares.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// following conditions:
//
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// in all copies or substantial portions of the Software.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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var common = require('../common');
var assert = require('assert');

var dns = require('dns');


// Try resolution without callback

dns.lookup(null, function(error, result, addressType) {
  assert.equal(null, result);
  assert.equal(4, addressType);
});

dns.lookup('127.0.0.1', function(error, result, addressType) {
  assert.equal('127.0.0.1', result);
  assert.equal(4, addressType);
});

dns.lookup('::1', function(error, result, addressType) {
  assert.equal('::1', result);
  assert.equal(6, addressType);
});

// Try calling resolve with an unsupported type.
assert.throws(function() {
  dns.resolve('www.google.com', 'HI');
}, /Unknown type/);

// Windows doesn't usually have an entry for localhost 127.0.0.1 in
// C:\Windows\System32\drivers\etc\hosts
// so we disable this test on Windows.
if (process.platform != 'win32') {
  dns.resolve('127.0.0.1', 'PTR', function(error, domains) {
    if (error) throw error;
    assert.ok(Array.isArray(domains));
  });
}