<!DOCTYPE html>
<title>Prefetching double SignedHTTPExchange files must not crash</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script src="./resources/sxg-util.js"></script>
<body>
<script>
function addPrefetch(url) {
  let link = document.createElement('link');
  link.rel = 'prefetch';
  link.href = url;
  document.body.appendChild(link);
}
promise_test(async (t) => {
  const sxg1_url =
      get_host_info().HTTPS_ORIGIN + '/signed-exchange/resources/sxg/sxg-location.sxg?1';
  const sxg2_url =
      get_host_info().HTTPS_ORIGIN + '/signed-exchange/resources/sxg/sxg-location.sxg?2';
  addPrefetch(sxg1_url);
  addPrefetch(sxg2_url);
  await new Promise(resolve => {
    setInterval(() => {
      const entries = performance.getEntriesByType("resource");
      let hit_count = 0;
      for (let i = 0; i < entries.length; ++i) {
        const entry = entries[i];
        if (entry.name == sxg1_url || entry.name == sxg2_url) {
          if (++hit_count == 2)
            resolve();
        }
      }
    }, 100);
  });
}, 'Prefetching double SignedHTTPExchange files must not crash');
</script>
</body>
