'use strict';

const common = require('../common');

const assert = require('assert');

const dns = require('dns');

// Try resolution without callback

dns.lookup(null, common.mustCall((error, result, addressType) => {

assert.ifError(error);

assert.strictEqual(null, result);

assert.strictEqual(4, addressType);

}));

dns.lookup('127.0.0.1', common.mustCall((error, result, addressType) => {

assert.ifError(error);

assert.strictEqual('127.0.0.1', result);

assert.strictEqual(4, addressType);

}));

dns.lookup('::1', common.mustCall((error, result, addressType) => {

assert.ifError(error);

assert.strictEqual('::1', result);

assert.strictEqual(6, addressType);

}));

// Try calling resolve with an unsupported type.

assert.throws(() => dns.resolve('www.google.com', 'HI'), /Unknown type/);

// Try calling resolve with an unsupported type that's an object key

assert.throws(() => dns.resolve('www.google.com', 'toString'), /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 (!common.isWindows) {

dns.reverse('127.0.0.1', common.mustCall(function(error, domains) {

assert.ifError(error);

assert.ok(Array.isArray(domains));

}));

}