preventExtensions-idempotent.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 = 'preventExtensions-idempotent.js';

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

var BUGNUMBER = 599459;

var summary = 'Object.preventExtensions should be idempotent';

print(BUGNUMBER + ": " + summary);

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

 * BEGIN TEST *

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

var obj = {};

assertEq(Object.preventExtensions(obj), obj);

assertEq(Object.isExtensible(obj), false);

assertEq(Object.preventExtensions(obj), obj);

assertEq(Object.isExtensible(obj), false);

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

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("All tests passed!");