Tests that uncaught promise rejections happenned in workers are logged into console.

worker-with-unhandled-promises.js:3 Uncaught (in promise) Error: err1
runPromisesInWorker @ worker-with-unhandled-promises.js:3
onmessage @ worker-with-unhandled-promises.js:25
Worker.postMessage
startWorker @ console-uncaught-promise-in-worker.js:19
setTimeout
(anonymous) @ console-uncaught-promise-in-worker.js:24
worker-with-unhandled-promises.js:21 Uncaught (in promise) Error: err2
runPromisesInWorker @ worker-with-unhandled-promises.js:21
onmessage @ worker-with-unhandled-promises.js:25
Worker.postMessage
startWorker @ console-uncaught-promise-in-worker.js:19
setTimeout
(anonymous) @ console-uncaught-promise-in-worker.js:24