prefetch-activation-beacon.tentative.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:
- /speculation-rules/activation-header/prefetch-activation-beacon.tentative.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta name="timeout" content="long">

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

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

<script src="/common/dispatcher/dispatcher.js"></script>

<script src="/common/utils.js"></script>

<script src="/speculation-rules/resources/utils.js"></script>

<script src="/speculation-rules/prefetch/resources/utils.sub.js"></script>

<script>

  setup(() => assertSpeculationRulesIsSupported());

  promise_test(async t => {

    const uuid = token();

    const agent = await spawnWindow(t, {}, uuid);

    const prefetchUrl = new URL(`resources/activation_beacon.py?uuid=${uuid}&action=serve`, location.href);

    // Trigger prefetch

    await agent.forceSinglePrefetch(prefetchUrl.toString());

    // Navigate to the prefetched URL

    await agent.navigate(prefetchUrl, { expectedDestinationUrl: null });

    const checkUrl = new URL(`resources/activation_beacon.py?uuid=${uuid}&action=check`, location.href);

    // Poll for beacon received

    let state = {};

    let attempts = 0;

    while (!state.beacon_received && attempts < 20) {

        await new Promise(resolve => t.step_timeout(resolve, 500));

        let response = await fetch(checkUrl);

        state = await response.json();

        attempts++;

    assert_true(state.fetched, "Resource should have been fetched.");

    assert_true(state.beacon_received, "Beacon should have been received.");

  }, "Test that prefetch activation beacon is sent upon activation.");

</script>