[Worker] Test unhandled promise rejection event.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

Starting worker: ../resources/unhandled-promise-rejection-order-in-workers.js
PASS [Worker] error.type is "unhandledrejection"
PASS [Worker] error.cancelable is true
PASS [Worker] error.promise is promise[0]
PASS [Worker] error.reason is 0
PASS [Worker] error.type is "unhandledrejection"
PASS [Worker] error.cancelable is true
PASS [Worker] error.promise is promise[1]
PASS [Worker] error.reason is 1
PASS [Worker] error.type is "unhandledrejection"
PASS [Worker] error.cancelable is true
PASS [Worker] error.promise is promise[2]
PASS [Worker] error.reason is 2
PASS successfullyParsed is true

TEST COMPLETE