1'use strict'; 2 3const common = require('../common'); 4 5const assert = require('assert'); 6const dnsPromises = require('dns').promises; 7 8dnsPromises.lookupService('127.0.0.1', 22).then(common.mustCall((result) => { 9 assert.strictEqual(result.service, 'ssh'); 10 assert.strictEqual(typeof result.hostname, 'string'); 11 assert.notStrictEqual(result.hostname.length, 0); 12})); 13 14// Use an IP from the RFC 5737 test range to cause an error. 15// Refs: https://tools.ietf.org/html/rfc5737 16assert.rejects( 17 () => dnsPromises.lookupService('192.0.2.1', 22), 18 { code: /^(?:ENOTFOUND|EAI_AGAIN)$/ } 19); 20