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ES5Harness.registerTest({

    id: "15.4.4.15-5-21",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-5-21.js",

    description: "Array.prototype.lastIndexOf when value of 'fromIndex' which is an Object, and has an own toString method",

    test: function testcase() {

        // objects inherit the default valueOf() method from Object
        // that simply returns itself. Since the default valueOf() method
        // does not return a primitive value, ES next tries to convert the object
        // to a number by calling its toString() method and converting the
        // resulting string to a number.
        var fromIndex = {
            toString: function () {
                return '2';
            }
        };
        var targetObj = new RegExp();

        return [0, true, targetObj, 3, false].lastIndexOf(targetObj, fromIndex) === 2 &&
        [0, true, 3, targetObj, false].lastIndexOf(targetObj, fromIndex) === -1;
    },

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

});