controlled-dedicatedworker-postMessage.https.html

<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/test-helpers.sub.js"></script>
</head>
<body>
<script>
promise_test(async (test) => {
    const registration = await navigator.serviceWorker.register("postMessage-client-worker.js", { scope : 'resources' });
    activeWorker = registration.active;
    if (activeWorker)
        return;

    activeWorker = registration.installing;
    await new Promise(resolve => {
        activeWorker.addEventListener('statechange', () => {
            if (activeWorker.state === "activated")
                resolve();
        });
    });
}, "Register service worker");

promise_test(async (test) => {
    const worker = new Worker('resources/controlled-worker-postMessage.js');
    const event = await new Promise((resolve, reject) => {
       test.step_timeout(() => reject("test timed out"), 3000);
       worker.onmessage = resolve;
    });
    assert_equals(event.data, 0);
}, "Verify dedicated worker gets messages if setting event listener early");

promise_test(async (test) => {
    const worker = new Worker('resources/controlled-worker-late-postMessage.js?repeatMessages');
    const event = await new Promise((resolve, reject) => {
       test.step_timeout(() => reject("test timed out"), 3000);
       worker.onmessage = resolve;
    });
    assert_not_equals(event.data, "No message received");
    assert_true(event.data > 0);
}, "Verify dedicated worker does not get all messages if not setting event listener early");
</script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/service-workers/service-worker/controlled-dedicatedworker-postMessage.https.html