15.2.3.11-1 (TestCases/chapter15/15.2/15.2.3/15.2.3.11/15.2.3.11-1.js) Object.isSealed throws TypeError if type of first param is not Object On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS ES5Harness.preconditionPassed is true FAIL ES5Harness.testPassed should be true (of type boolean). Was undefined (of type undefined). PASS successfullyParsed is true TEST COMPLETE