JSTests/test262/test/built-ins/Array/prototype/indexOf/15.4.4.14-9-a-18.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.indexof
es5id: 15.4.4.14-9-a-18
description: >
    Array.prototype.indexOf - decreasing length of array with
    prototype property causes prototype index property to be visited
---*/

        var arr = [0, 1, 2];

            Object.defineProperty(Array.prototype, "2", {
                get: function () {
                    return "prototype";
                },
                configurable: true
            });

            Object.defineProperty(arr, "1", {
                get: function () {
                    arr.length = 2;
                    return 1;
                },
                configurable: true
            });

assert.sameValue(arr.indexOf("prototype"), 2, 'arr.indexOf("prototype")');