LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.15-2-7.js

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ES5Harness.registerTest({

    id: "15.4.4.15-2-7",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-2-7.js",

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

    test: function testcase() {

        var proto = { length: 2 };

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

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

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

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

});