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