<!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="/websockets/constants.sub.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.sub.js"></script>
<script>
setup(() => assertSpeculationRulesIsSupported());

promise_test(async t => {
  let agent = await spawnWindow(t, { protocol: 'https', pipe: 'header(Cache-Control, no-store)' });
  let previousUrl = await agent.execute_script(() => location.href);
  await agent.execute_script(async () => {
    window.preventBfcache = new WebSocket('wss://{{ports[wss][0]}}/echo');
  });

  let nextUrl = agent.getExecutorURL({ protocol: 'https', page: 2 });
  await agent.navigate(nextUrl);

  await agent.forceSinglePrefetch(previousUrl);
  await agent.execute_script(() => {
    window.executor.suspend(() => history.go(-1));
  });

  assert_equals(previousUrl, await agent.execute_script(() => location.href));
  assert_prefetched(await agent.getRequestHeaders(), "traversal should use prefetch");
}, "prefetches can be used for traversal navigations");

promise_test(async t => {
  let agent = await spawnWindow(t, { protocol: 'https', pipe: 'header(Cache-Control, no-store)' });
  let previousUrl = await agent.execute_script(() => location.href);
  await agent.execute_script(async () => {
    window.preventBfcache = new WebSocket('wss://{{ports[wss][0]}}/echo');
  });

  let nextUrl = agent.getExecutorURL({ protocol: 'https', page: 2 });
  await agent.navigate(nextUrl);

  await agent.forceSinglePrefetch(previousUrl);
  // In https://html.spec.whatwg.org/multipage/nav-history-apis.html#delta-traverse,
  // `sourceDocument` is `History`'s relevant global object's associated
  // Document. In this case, it's `iframe.contentDocument`, and thus the
  // prefetch from `win`'s Document (iframe's parent Document) isn't used.
  await agent.execute_script(() => {
    window.executor.suspend(() => {
      const iframe = document.createElement('iframe');
      document.body.appendChild(iframe);
      iframe.contentWindow.history.go(-1);
    });
  });

  assert_equals(previousUrl, await agent.execute_script(() => location.href));
  assert_not_prefetched(await agent.getRequestHeaders(),
      "prefetch from different Document should not be used");
}, "History's Document is used for traversal navigations");

promise_test(async t => {
  let agent = await spawnWindow(t, { protocol: 'https', pipe: 'header(Cache-Control, no-store)' });
  let previousUrl = await agent.execute_script(() => location.href);
  await agent.forceSinglePrefetch(previousUrl);
  await agent.execute_script(() => {
    window.executor.suspend(() => location.reload());
  });

  assert_equals(previousUrl, await agent.execute_script(() => location.href));
  assert_prefetched(await agent.getRequestHeaders(), "reload should use prefetch");
}, "prefetches can be used for reload navigations");
</script>
