extensibility-02.js

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/*

 * Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/licenses/publicdomain/

 * Contributor:

 *   Jeff Walden <jwalden+code@mit.edu>

*/

var gTestfile = '15.2.3.4-01.js';

//-----------------------------------------------------------------------------

var BUGNUMBER = 492849;

var summary = 'ES5: Implement Object.preventExtensions, Object.isExtensible';

print(BUGNUMBER + ": " + summary);

/**************

 * BEGIN TEST *

 **************/

assertEq(typeof Object.isExtensible, "function");

assertEq(Object.isExtensible.length, 1);

var slowArray = [1, 2, 3];

slowArray.slow = 5;

var objs =

  [{}, { 1: 2 }, { a: 3 }, [], [1], [, 1], slowArray, function a(){}, /a/];

for (var i = 0, sz = objs.length; i < sz; i++)

  var o = objs[i];

  assertEq(Object.isExtensible(o), true, "object " + i + " not extensible?");

  var o2 = Object.preventExtensions(o);

  assertEq(o, o2);

  assertEq(Object.isExtensible(o), false, "object " + i + " is extensible?");

/******************************************************************************/

reportCompare(true, true);

print("All tests passed!");