subresource-load-with-skip-handler.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>
  The subresource load should not be blocked by skipping the fetch handler.
</title>
<!-- This cannot be upstreamed to WPT because it test uses Chrome's UseCounter
     mechanism. -->
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/test-helpers.js"></script>
<script>
function isUseCounted(win, feature) {
  return win.internals.isUseCounted(win.document, feature);
}

function observeUseCounter(win, feature) {
  return win.internals.observeUseCounter(win.document, feature);
}

function addStyleSheet(win, href) {
  const link = win.document.createElement('link');
  link.rel = 'stylesheet';
  link.href = href;
  win.document.head.appendChild(link);
}

const scope = 'resources/simple.html';
// |kServiceWorkerNotHandledSubresourceLoad| in web_feature.mojom.
const kFeature = 4363;

promise_test(async t => {
  const registration = await service_worker_unregister_and_register(
      t, 'resources/empty-fetch-handler.js', scope);
  t.add_cleanup(() => { registration.unregister(); });
  await wait_for_state(t, registration.installing, 'activated');

  // Set up the iframe in the scope.
  const frame = await with_iframe('resources/simple.html');
  t.add_cleanup(() => { frame.remove(); });
  const win = frame.contentWindow;

  // Ensure that the window is controlled by the service worker.
  assert_not_equals(win.navigator.serviceWorker.controller, null);

  // The stylesheet loaded at the page controlled by the service worker.
  addStyleSheet(win, 'font-face.css');

  // Ensure the service worker has been skipped.
  await observeUseCounter(win, kFeature);
  assert_true(isUseCounted(win, kFeature));
}, 'An empty service worker handler should be skipped for loading subresource');
</script>
chromium/third_party/blink/web_tests/http/tests/serviceworker/subresource-load-with-skip-handler.html
