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

Added tests to check error in dns.lookupService to increase coverage. PR-URL: #22908 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Weijia Wang <[email protected]> Reviewed-By: Sakthipriyan Vairamani <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: James M Snell <[email protected]>
nodejs · Sep 20, 2018 · dcce2d6 · dcce2d6
1 parent fb68ef2
commit dcce2d6
Showing 1 changed file with 19 additions and 0 deletions.
diff --git a/test/parallel/test-dns-lookupService.js b/test/parallel/test-dns-lookupService.js
@@ -0,0 +1,19 @@
+// Flags: --expose-internals
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const cares = process.binding('cares_wrap');
+const { UV_ENOENT } = process.binding('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'
+  }
+);