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test: add test-dns-promises-lookupService #31640

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Merged
merged 1 commit into from
Feb 7, 2020
Merged

test: add test-dns-promises-lookupService #31640

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19 changes: 19 additions & 0 deletions test/parallel/test-dns-promises-lookupService.js
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Original file line number Diff line number Diff line change
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'use strict';

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

const assert = require('assert');
const dnsPromises = require('dns').promises;

dnsPromises.lookupService('127.0.0.1', 22).then(common.mustCall((result) => {
assert.strictEqual(result.service, 'ssh');
assert.strictEqual(typeof result.hostname, 'string');
assert.notStrictEqual(result.hostname.length, 0);
}));

// Use an IP from the RFC 5737 test range to cause an error.
// Refs: https://tools.ietf.org/html/rfc5737
assert.rejects(
() => dnsPromises.lookupService('192.0.2.1', 22),
{ code: /^(?:ENOTFOUND|EAI_AGAIN)$/ }
);