Test for correct properties on Error objects. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS enumerableProperties(error) is [] FAIL enumerableProperties(nativeError) should be stack,line,sourceURL. Was . PASS Object.getPrototypeOf(nativeError).name is "RangeError" PASS Object.getPrototypeOf(nativeError).message is "" PASS successfullyParsed is true TEST COMPLETE