fetch-event-download.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/tentative/fetch-event-download.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Service Worker: FetchEvent fires for &lt;a download&gt; (crbug.com/40410035)</title>

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

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

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

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

<script src="/resources/testdriver-vendor.js"></script>

<script src="../resources/test-helpers.sub.js"></script>

<script src="../resources/fetch-event-download-helpers.js"></script>

<body>

<script>

'use strict';

// The SW lives at resources/fetch-event-download-worker.js with scope

// resources/. The `<a download>` link points into that scope so the SW

// receives the fetch event.

const WORKER = 'resources/fetch-event-download-worker.js';

const SCOPE = 'resources/';

promise_test(async (t) => {

  const reg = await service_worker_unregister_and_register(t, WORKER, SCOPE);

  t.add_cleanup(() => reg.unregister());

  await wait_for_state(t, reg.installing, 'activated');

  const channelId = uniqueChannelId();

  const targetUrl = SCOPE + 'download-target.txt?channel=' + channelId;

  const messagePromise = nextChannelMessage(t, channelId);

  await clickDownloadAnchor(t, targetUrl);

  const data = await messagePromise;

  assert_equals(data.type, 'fetch',

      'SW should observe a fetch event for the download URL.');

  assert_equals(new URL(data.url).pathname,

      new URL(targetUrl, location).pathname,

      'fetch event URL matches the <a download> target.');

  assert_equals(data.destination, '',

      'Per HTML "Downloading hyperlinks", the request destination must be "".');

  assert_equals(data.mode, 'navigate',

      'Per HTML "Downloading hyperlinks", the request mode must be "navigate".');

  assert_equals(data.method, 'GET',

      'Downloads use GET.');

}, 'FetchEvent fires for <a download> with destination "".');

</script>

</body>