1 Make sure that MessageEvent.source is properly set in connect event.
3 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
6 Starting worker: resources/messageevent-source.js
7 PASS [Worker] event.__proto__ is MessageEvent.prototype
8 PASS [Worker] event.source is event.ports[0]
9 PASS successfullyParsed is true