message-event-ports.https.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /service-workers/service-worker/ServiceWorkerGlobalScope/message-event-ports.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

<title>Service Worker GlobalScope onerror event</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

</head>

<body>

<canvas id=canvas></canvas>

<script>

var registration;

async function registerServiceWorker()

    const registration = await navigator.serviceWorker.register("message-event-ports-worker.js", { scope : "." });

    let activeWorker = registration.active;

    if (activeWorker)

        return registration;

    activeWorker = registration.installing;

    return new Promise(resolve => {

        activeWorker.addEventListener('statechange', () => {

            if (activeWorker.state === "activated")

                resolve(registration);

});

});

promise_test(async (test) => {

    registration = await registerServiceWorker();

    registration.active.postMessage("test");

    let result = await new Promise(resolve => navigator.serviceWorker.onmessage = e => resolve(e.data));

    assert_equals(result, "same ports array", "empty array");

    const channel = new MessageChannel();;

    const port = channel.port1;

    registration.active.postMessage({ port }, [port]);

    result = await new Promise(resolve => navigator.serviceWorker.onmessage = e => resolve(e.data));

    assert_equals(result, "same ports array", "not empty array");

}, "Verify MessageEvent.ports getter returns the same object");

</script>

</body>

</html>