mozilla-release/testing/web-platform/tests/clipboard-apis/text-write-read/async-write-readText-manual.https.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>
  Async Clipboard write ([text/plain ClipboardItem]) -> readText tests
</title>
<link rel="help" href="https://w3c.github.io/clipboard-apis/#async-clipboard-api">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async function readWriteTest(textInput) {
  promise_test(async t => {
    const blobInput = new Blob([textInput], {type: 'text/plain'});
    const clipboardItem = new ClipboardItem({'text/plain': blobInput});

    await navigator.clipboard.write([clipboardItem]);
    const textOutput = await navigator.clipboard.readText();

    assert_equals(textOutput, textInput);
  }, 'Verify write and read clipboard given text: ' + textInput);
}

readWriteTest('Clipboard write ([text/plain ClipboardItem) -> read text test');
readWriteTest('non-Latin1 text encoding test データ');
</script>
<p>
  Note: This is a manual test because it writes/reads to the shared system
  clipboard and thus cannot be run async with other tests that might interact
  with the clipboard.
</p>