preload-xhr.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /preload/preload-xhr.html - WPT Dashboard Interop Dashboard

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/common/utils.js"></script>

<script src="/preload/resources/preload_helper.js"></script>

<script>

const dummyContent = '<?xml version="1.0" encoding="utf-8"?>\n<root>Text.me</root>\n';

promise_test(async (t) => {

  const url = `resources/dummy.xml?token=${token()}`;

  const link = document.createElement('link');

  link.rel = 'preload';

  link.as = 'fetch';

  link.href = url;

  link.crossOrigin = 'anonymous';

  document.head.appendChild(link);

  const xhr = new XMLHttpRequest();

  await new Promise((resolve, reject) => {

    xhr.onloadend = resolve;

    xhr.onloaderror = reject;

    xhr.open('GET', url);

    xhr.send();

});

  verifyNumberOfResourceTimingEntries(url, 1);

  assert_equals(xhr.status, 200);

  assert_equals(xhr.responseText, dummyContent);

}, 'Make an XHR request immediately after creating link rel=preload.');

promise_test(async (t) => {

  const url = `resources/dummy.xml?token=${token()}`;

  const link = document.createElement('link');

  link.rel = 'preload';

  link.as = 'fetch';

  link.href = url;

  link.crossOrigin = 'anonymous';

  await new Promise((resolve, reject) => {

    link.addEventListener('load', resolve, {once: true});

    link.addEventListener('error', reject, {once: true});

    document.head.appendChild(link);

});

  const xhr = new XMLHttpRequest();

  await new Promise((resolve, reject) => {

    xhr.onloadend = resolve;

    xhr.onloaderror = reject;

    xhr.open('GET', url);

    xhr.send();

});

  verifyNumberOfResourceTimingEntries(url, 1);

  assert_equals(xhr.status, 200);

  assert_equals(xhr.responseText, dummyContent);

}, 'Make an XHR request after loading link rel=preload.');

</script>