fetch-event-download-fallback.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-fallback.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Service Worker: download FetchEvent without respondWith() falls through (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';

// When the SW observes the download FetchEvent but does NOT call

// event.respondWith(), the request must fall back to the network. We can't

// observe the saved file from script, but we can observe that:

//   (a) the SW saw the fetch event (so the new interception path ran), and

//   (b) the page itself didn't navigate (so the click was treated as a

//       download, not as a regular link click).

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 + '&mode=fallback';

  const messagePromise = nextChannelMessage(t, channelId);

  const urlBefore = location.href;

  await clickDownloadAnchor(t, targetUrl);

  const data = await messagePromise;

  assert_equals(data.type, 'fetch',

      'SW must still observe the fetch event even without respondWith().');

  assert_equals(data.destination, '');

  assert_equals(data.mode, 'navigate',

      'Download FetchEvent mode must be "navigate" (HTML "Downloading hyperlinks").');

  // The page must not navigate as a result of the download click.

  assert_equals(location.href, urlBefore,

      'The page must not navigate when <a download> is clicked.');

}, 'Download FetchEvent without respondWith() falls back without navigating the page.');

</script>

</body>