This tests that isPrototypeOf works according to the ECMA spec. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS Object.isPrototypeOf('string') is false PASS Array.prototype.isPrototypeOf(new Array()) is true PASS ObjectA.prototype.isPrototypeOf(objb) is true PASS ObjectA.prototype.isPrototypeOf(objc) is true PASS successfullyParsed is true TEST COMPLETE