js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-2-5.js


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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.

/*---
esid: sec-array.prototype.lastindexof
description: >
    Array.prototype.lastIndexOf - 'length' is own data property that
    overrides an inherited accessor property on an Array-like object
---*/

var proto = {};
Object.defineProperty(proto, "length", {
  get: function() {
    return 0;
  },
  configurable: true
});

var Con = function() {};
Con.prototype = proto;

var child = new Con();

Object.defineProperty(child, "length", {
  value: 2,
  configurable: true
});
child[1] = null;

assert.sameValue(Array.prototype.lastIndexOf.call(child, null), 1, 'Array.prototype.lastIndexOf.call(child, null)');

reportCompare(0, 0);