test: use ES6 classes instead of util.inherits

PR-URL: https://github.com/nodejs/node/pull/16938
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

1 files changed, 1 insertions, 6 deletions

diff --git a/test/parallel/test-readline-keys.js b/test/parallel/test-readline-keys.js
index 1b05b06f58..62d5ab24b8 100644
--- a/test/parallel/test-readline-keys.js
+++ b/test/parallel/test-readline-keys.js
@@ -2,14 +2,9 @@
 const common = require('../common');
 const PassThrough = require('stream').PassThrough;
 const assert = require('assert');
-const inherits = require('util').inherits;
 const Interface = require('readline').Interface;
 
-
-function FakeInput() {
-  PassThrough.call(this);
-}
-inherits(FakeInput, PassThrough);
+class FakeInput extends PassThrough {}
 
 function extend(k) {
   return Object.assign({ ctrl: false, meta: false, shift: false }, k);