scope-001.js - mozsearch

Enable keyboard shortcuts

/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

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

var BUGNUMBER = '53268';

var status = 'Testing scope after changing obj.__proto__';

var expect= '';

var actual = '';

var obj = {};

Object.defineProperty(this, "five", {

  value: 5,

  enumerable: true,

  writable: false

});

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

test();

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

function test()

  printBugNumber(BUGNUMBER);

  printStatus (status);

  status= 'Step 1:  setting obj.__proto__ = global object';

  obj.__proto__ = this;

  actual = obj.five;

  expect=5;

  reportCompare (expect, actual, status);

  obj.five=1;

  actual = obj.five;

  expect=5;

  reportCompare (expect, actual, status);

  status= 'Step 2:  setting obj.__proto__ = null';

  obj.__proto__ = null;

  actual = obj.five;

  expect=undefined;

  reportCompare (expect, actual, status);

  obj.five=2;

  actual = obj.five;

  expect=2;

  reportCompare (expect, actual, status);

  status= 'Step 3:  setting obj.__proto__  to global object again';

  obj.__proto__ = this;

  actual = obj.five;

  expect=2;  //<--- (FROM STEP 2 ABOVE)

  reportCompare (expect, actual, status);

  obj.five=3;

  actual = obj.five;

  expect=3;

  reportCompare (expect, actual, status);

  status= 'Step 4:  setting obj.__proto__   to  null again';

  obj.__proto__ = null;

  actual = obj.five;

  expect=3;  //<--- (FROM STEP 3 ABOVE)

  reportCompare (expect, actual, status);

  obj.five=4;

  actual = obj.five;

  expect=4;

  reportCompare (expect, actual, status);