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22 ES5Harness.registerTest({
26 path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-5-21.js",
28 description: "Array.prototype.lastIndexOf when value of 'fromIndex' which is an Object, and 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 toString: function () {
42 var targetObj = new RegExp();
44 return [0, true, targetObj, 3, false].lastIndexOf(targetObj, fromIndex) === 2 &&
45 [0, true, 3, targetObj, false].lastIndexOf(targetObj, fromIndex) === -1;
48 precondition: function prereq() {
49 return fnExists(Array.prototype.lastIndexOf);