JSTests/test262/test/built-ins/Array/prototype/every/15.4.4.16-2-4.js

// 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.every
description: >
    Array.prototype.every - 'length' is own data property that
    overrides an inherited data property on an Array
---*/

var arrProtoLen = 0;

function callbackfn1(val, idx, obj) {
  return val > 10;
}

function callbackfn2(val, idx, obj) {
  return val > 11;
}

arrProtoLen = Array.prototype.length;
Array.prototype.length = 0;
Array.prototype[2] = 9;

assert([12, 11].every(callbackfn1), '[12, 11].every(callbackfn1) !== true');
assert.sameValue([12, 11].every(callbackfn2), false, '[12, 11].every(callbackfn2)');