build: move zone.js to angular repo (#30962)

PR Close #30962

packages/zone.js/test/ws-client.js

@@ -0,0 +1,14 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+const ws = require('nodejs-websocket');
+
+const conn = ws.connect('ws://localhost:8001', {}, function() {
+  conn.send('close');
+  conn.close();
+});