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test: add tests to check error in dns.lookupService.

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Added tests to check error in dns.lookupService to
increase coverage.

PR-URL: https://github.com/nodejs/node/pull/22908
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
This commit is contained in:
Masashi Hirano 2018-09-17 17:57:08 +09:00 committed by Daniel Bevenius
parent 2811ae4801
commit 0623aabbe1
1 changed files with 20 additions and 0 deletions
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20
test/parallel/test-dns-lookupService.js Normal file
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// Flags: --expose-internals
'use strict';
const common = require('../common');
const assert = require('assert');
const { internalBinding } = require('internal/test/binding');
const cares = internalBinding('cares_wrap');
const { UV_ENOENT } = internalBinding('uv');
const dns = require('dns');
// Stub `getnameinfo` to *always* error.
cares.getnameinfo = () => UV_ENOENT;
assert.throws(
() => dns.lookupService('127.0.0.1', 80, common.mustNotCall()),
{
code: 'ENOENT',
message: 'getnameinfo ENOENT 127.0.0.1',
syscall: 'getnameinfo'
}
);