LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.15-3-7.js

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ES5Harness.registerTest( {

    id: "15.4.4.15-3-7",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-3-7.js",

    description: "Array.prototype.lastIndexOf when value of 'length' is a number (value is a negative number)",

    test: function testcase() {

        var obj = { 4: -Infinity, 5: Infinity, length: 5 - Math.pow(2, 32) };

        return Array.prototype.lastIndexOf.call(obj, -Infinity) === 4 &&
            Array.prototype.lastIndexOf.call(obj, Infinity) === -1;
    },

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

});