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chromium/third_party/blink/web_tests/external/wpt/infrastructure/assumptions/cookie.html 

<!doctype html>
<title>cookies work in default browse settings</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="help" href="https://html.spec.whatwg.org/#dom-document-cookie">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
  test(t => {
    t.add_cleanup(() => {
      let date = new Date();
      date.setTime(date.getTime() - 10000);
      document.cookie = "name=''; expires=" + date.toGMTString();
    });
    document.cookie = "name=test_cookie";
    assert_not_equals(document.cookie.match(/name=test_cookie/), null);
  });
</script>