fetch-event-download-respond-with.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-respond-with.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Service Worker: event.respondWith() accepted for download FetchEvent (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';

// Verifies that a service worker may call event.respondWith() on a download

// FetchEvent without raising errors. We can't read the saved file's bytes

// from script (no filesystem access), so we assert the SW-side observable

// outcome: the fetch event was dispatched, the SW called respondWith, and

// no error event fired on the SW.

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');

  // Watch for SW errors. Using `error` on the registration's active worker

  // fires for uncaught exceptions thrown inside the worker, which is what

  // a misbehaving respondWith() would surface as.

  let workerError = null;

  reg.active.addEventListener('error', (e) => { workerError = e; });

  const channelId = uniqueChannelId();

  // mode=respond is the worker's default; making it explicit for readability.

  const targetUrl =

      SCOPE + 'download-target.txt?channel=' + channelId + '&mode=respond';

  const messagePromise = nextChannelMessage(t, channelId);

  await clickDownloadAnchor(t, targetUrl);

  const data = await messagePromise;

  assert_equals(data.type, 'fetch',

      'SW should observe the fetch event before respondWith() resolves.');

  assert_equals(data.destination, '',

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

  // Give the microtask that resolves respondWith()'s promise a turn to run,

  // then ensure no error escaped from the worker.

  await new Promise((r) => step_timeout(r, 100));

  assert_equals(workerError, null,

      'No error event should fire on the worker after respondWith().');

}, 'event.respondWith() is accepted for a download FetchEvent.');

</script>

</body>