-Tests postMessage to and from a ServiceWorker
-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
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-messageChannel = new MessageChannel()
-messageChannel.port1.onmessage = onMessageHandler
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-navigator.serviceWorker.register('postmessage-worker.js')
-serviceWorker.postMessage({port: messageChannel.port2}, [messageChannel.port2])
-serviceWorker.postMessage({value: 1})
-serviceWorker.postMessage({value: 2})
-serviceWorker.postMessage({done: true})
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-onMessageHandler: "Acking value: 1"
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-onMessageHandler: "Acking value: 2"
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-onMessageHandler: "quit"
-PASS successfullyParsed is true
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-TEST COMPLETE
+PASS postMessage to a ServiceWorker (and back via MessagePort)