15.2.3.6-4-5.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. Step 6 of [[DefineOwnProperty]] returns if

    every field of desc also occurs in current and every field in desc has

    the same value as current.

es5id: 15.2.3.6-4-5

description: >

    Object.defineProperty is no-op if current and desc are the same

    data desc

---*/

function sameDataDescriptorValues(d1, d2) {

  return (d1.value === d2.value &&

    d1.enumerable === d2.enumerable &&

    d1.writable === d2.writable &&

    d1.configurable === d2.configurable);

var o = {};

// create a data valued property with the following attributes:

// value: 101, enumerable: true, writable: true, configurable: true

o["foo"] = 101;

// query for, and save, the desc. A subsequent call to defineProperty

// with the same desc should not disturb the property definition.

var d1 = Object.getOwnPropertyDescriptor(o, "foo");

// now, redefine the property with the same descriptor

// the property defintion should not get disturbed.

var desc = {

  value: 101,

  enumerable: true,

  writable: true,

  configurable: true

};

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

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

assert.sameValue(sameDataDescriptorValues(d1, d2), true, 'sameDataDescriptorValues(d1, d2)');

reportCompare(0, 0);