mozilla-release/testing/web-platform/tests/trust-tokens/end-to-end/has-trust-token-with-no-top-frame.tentative.https.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Tests the Trust Token API's hasTrustToken behavior in documents with no top frame</title>
<link rel="help" href="https://github.com/WICG/trust-token-api" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<body>
  <script>
    'use strict';

    const frame = document.createElement('iframe');
    document.body.appendChild(frame);
    const cachedDocument = window[0].document;
    frame.remove();

    test(() => {
      assert_equals(cachedDocument.hasTrustToken("https://issuer.example"), undefined,
        "Can't construct a Promise in a destroyed execution context.");
    }, 'hasTrustToken in a destroyed document.');
  </script>
</body>