url: error when domainTo*() is called w/o argument

PR-URL: https://github.com/nodejs/node/pull/12134
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/test/parallel/test-whatwg-url-domainto.js b/test/parallel/test-whatwg-url-domainto.js
index f891f95a19..70b32c8dce 100644
--- a/test/parallel/test-whatwg-url-domainto.js
+++ b/test/parallel/test-whatwg-url-domainto.js
@@ -13,6 +13,15 @@ const { domainToASCII, domainToUnicode } = require('url');
 const tests = require('../fixtures/url-idna.js');
 
 {
+  assert.throws(() => domainToASCII(),
+                /^TypeError: "domain" argument must be specified$/);
+  assert.throws(() => domainToUnicode(),
+                /^TypeError: "domain" argument must be specified$/);
+  assert.strictEqual(domainToASCII(undefined), 'undefined');
+  assert.strictEqual(domainToUnicode(undefined), 'undefined');
+}
+
+{
   for (const [i, { ascii, unicode }] of tests.valid.entries()) {
     assert.strictEqual(ascii, domainToASCII(unicode),
                        `domainToASCII(${i + 1})`);