15.2.3.6-4-21.js - mozsearch

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// Copyright (c) 2012 Ecma International.  All rights reserved.

// This code is governed by the BSD license found in the LICENSE file.

/*---

info: |

    Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method

    of O to define the property. For non-configurable properties, step 11.a.ii

    of [[DefineOwnProperty]] permits setting a getter if absent.

es5id: 15.2.3.6-4-21

description: >

    Object.defineProperty permits setting a getter (if absent) of

    non-configurable accessor properties(8.12.9 step 11.a.ii)

---*/

var o = {};

// create an accessor property; all other attributes default to false.

// dummy setter

var setter = function(x) {}

var d1 = {

  set: setter

};

Object.defineProperty(o, "foo", d1);

// now, trying to set the getter should succeed even though [[Configurable]]

// on the original property will be false. Existing values of need to be preserved.

var getter = undefined;

var desc = {

  get: getter

};

Object.defineProperty(o, "foo", desc);

var d2 = Object.getOwnPropertyDescriptor(o, "foo");

assert.sameValue(d2.get, getter, 'd2.get');

assert.sameValue(d2.set, setter, 'd2.set');

assert.sameValue(d2.configurable, false, 'd2.configurable');

assert.sameValue(d2.enumerable, false, 'd2.enumerable');

reportCompare(0, 0);