cobalt/black_box_tests/testdata/worker_load_test.html

<!DOCTYPE html>
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<head>
  <title>Verify that worker loading is blocked and reported as expected</title>
  <script src='black_box_js_test_utils.js'></script>
</head>

<body>
  <script>
    window.addEventListener('error', notReached);
    const workerOnError = (filename, resolve) => event => {
      assertIncludes(filename, event.message);
      assertIncludes('aborted or failed with code 404', event.message);
      assertIncludes(filename, event.filename);
      resolve();
    };
    Promise.all([
      new Promise(resolve => {
        const worker = new Worker('..:/blocked_worker.js');
        worker.addEventListener('error', workerOnError('blocked_worker.js', resolve));
      }),
      new Promise(resolve => {
        const worker = new Worker('nonexisting_worker.js');
        worker.addEventListener('error', workerOnError('nonexisting_worker.js', resolve));
      }),
    ]).then(onEndTest).catch(notReached);
  </script>
</body>