LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.15-3-23.js

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ES5Harness.registerTest( {

    id: "15.4.4.15-3-23",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-3-23.js",

    description: "Array.prototype.lastIndexOf uses inherited valueOf method when 'length' is an object with an own toString and an inherited valueOf methods",

    test: function testcase() {

        var toStringAccessed = false;
        var valueOfAccessed = false;

        var proto = {
            valueOf: function () {
                valueOfAccessed = true;
                return 2;
            }
        };

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

        var child = new Con();
        child.toString = function () {
            toStringAccessed = true;
            return 2;
        };

        var obj = {
            1: child,
            length: child
        };

        return Array.prototype.lastIndexOf.call(obj, child) === 1 && valueOfAccessed && !toStringAccessed;
    },

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

});