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22 ES5Harness.registerTest({
26 path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-3-19.js",
28 description: "Array.prototype.lastIndexOf when value of 'length' is an Object which has an own toString method",
30 test: function testcase() {
32 // objects inherit the default valueOf() method from Object
33 // that simply returns itself. Since the default valueOf() method
34 // does not return a primitive value, ES next tries to convert the object
35 // to a number by calling its toString() method and converting the
36 // resulting string to a number.
38 var targetObj = window;
44 toString: function () {
50 return Array.prototype.lastIndexOf.call(obj, targetObj) === 1 &&
51 Array.prototype.lastIndexOf.call(obj, 2) === -1;
54 precondition: function prereq() {
55 return fnExists(Array.prototype.lastIndexOf);