<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script src="../../../resources/bluetooth/bluetooth-helpers.js"></script>
<script>
'use strict';
promise_test(() => {
  // \u2764's UTF-8 respresentation is 3 bytes long.
  // 83 chars * 3 bytes/char = 249 bytes
  const unicode_name = '\u2764'.repeat(83);
  return assert_promise_rejects_with_message(
    requestDeviceWithKeyDown({filters: [{namePrefix: unicode_name}]}),
      new DOMException(
        'Failed to execute \'requestDevice\' on \'Bluetooth\': ' +
        'A device name can\'t be longer than 248 bytes.',
      'TypeError'));
}, 'Unicode string with utf8 representation longer than 248 bytes in ' +
   '\'namePrefix\' must throw NotFoundError.');
</script>