showDirectoryPicker-manual.https.html

<!doctype html>
<meta charset=utf-8>

<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/test-helpers.js"></script>

<script>

  promise_test(async t => {
    await new Promise(resolve => {
      window.addEventListener('DOMContentLoaded', resolve);
    });
    // Small delay to give chrome's test automation a chance to actually install
    // itself.
    await new Promise(resolve => step_timeout(resolve, 100));

    await window.test_driver.bless(
      'show a directory picker.<br />Please select file-system-access/resources/data/');
    const dir = await self.showDirectoryPicker();
    assert_true(dir instanceof FileSystemHandle);
    assert_true(dir instanceof FileSystemDirectoryHandle);
    assert_equals(dir.kind, "directory");
    assert_equals(dir.name, 'data');
    assert_array_equals(await getSortedDirectoryEntries(dir), ['testfile.txt']);

    promise_test(async t => {
      assert_equals(await dir.queryPermission(), 'granted');
    }, 'showDirectoryPicker returns correct permissions');
  }, 'showDirectoryPicker works');

</script>

chromium/third_party/blink/web_tests/external/wpt/file-system-access/showDirectoryPicker-manual.https.html