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chromium/third_party/blink/web_tests/external/wpt/clipboard-apis/permissions/writeText-granted.https.html 

<!doctype html>
<meta charset="utf-8">
<title>navigator.clipboard.writeText() succeeds when permission granted</title>
<link rel="help" href="https://w3c.github.io/clipboard-apis/#async-clipboard-api">
<body>Body needed for test_driver.click()</body>
<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 src="../resources/user-activation.js"></script>
<script>
'use strict';

promise_test(async () => {
  await tryGrantWritePermission();
  await waitForUserActivation();
  await navigator.clipboard.writeText('xyz');
}, 'navigator.clipboard.writeText() succeeds when permission granted');
</script>