LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.15-2-6.js

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ES5Harness.registerTest({

    id: "15.4.4.15-2-6",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-2-6.js",

    description: "Array.prototype.lastIndexOf when 'length' is own data property that overrides an inherited accessor property on an Array",

    test: function testcase() {
        var targetObj = new Date();
        try {
            Object.defineProperty(Array.prototype, "length", {
                get: function () {
                    return 0;
                },
                configurable: true
            });
            return [0, targetObj, 2].lastIndexOf(targetObj) === 1;
        } finally {
            delete Array.prototype.length;
        }
    },

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

});