LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.15-2-20.js

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ES5Harness.registerTest( {

    id: "15.4.4.15-2-20",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-2-20.js",

    description: "Array.prototype.lastIndexOf applied to String object which implements its own property get method",

    test: function testcase() {

        var obj = new Function("a, b", "return a + b"); //value of obj length property will be 2;
        obj[1] = "b";
        obj[2] = "c";

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

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

});