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chromium/third_party/blink/web_tests/external/wpt/infrastructure/testdriver/delete_all_cookies.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>TestDriver delete_all_cookies method</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script>
promise_test(async t => {
  document.cookie = "test1=1";
  document.cookie = "test2=2; path=/";
  document.cookie = "test3=3; path=/cookies/resources";

  return test_driver.delete_all_cookies().then(() => {
    assert_true(document.cookie === "");
  });
}, "DOM-set cookies get deleted");

promise_test(async t => {
  const cookies = ["test1=1", "test2=2; path=/", "test3=3; path=/cookies/resources", "test4=4; HttpOnly"];
  for (const cookie of cookies) {
      const encoded = encodeURIComponent(JSON.stringify(cookie));
      await fetch(`/cookies/resources/cookie.py?set=${encoded}`)
  }

  return test_driver.delete_all_cookies().then(() => {
    assert_true(document.cookie === "");
  });
}, "HTTP-set cookies get deleted");
</script>