LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.15-2-11.js

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ES5Harness.registerTest({

    id: "15.4.4.15-2-11",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-2-11.js",

    description: "Array.prototype.lastIndexOf when 'length' is inherited accessor property on an Array-like object",

    test: function testcase() {

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

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

        var child = new Con();
        child[1] = 1;
        child[2] = 2;

        return Array.prototype.lastIndexOf.call(child, 1) === 1 &&
            Array.prototype.lastIndexOf.call(child, 2) === -1;
    },

    precondition: function prereq() {
        return fnExists(Array.prototype.lastIndexOf) && fnExists(Object.defineProperty);
    }

});