JSTests/test262/test/built-ins/Object/preventExtensions/15.2.3.10-0-1.js

// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
es5id: 15.2.3.10-0-1
description: Object.preventExtensions must exist as a function
---*/

  var f = Object.preventExtensions;

assert.sameValue(typeof(f), "function", 'typeof(f)');