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>
    var window_onerror_count = 0;
    var worker_onerror_count = 0;
    window.onerror = (message, filename, lineno, colno, error) => {
      ++window_onerror_count;
      console.log('window got onerror', message);
      notReached();
    }

    // This worker is blocked because the URL can't resolve.
    try {
      var blocked_worker = new Worker('..:/blocked_worker.js');
      notReached();
    } catch (error) {
      console.log(error);
      assertEqual('SyntaxError', error.name);
    }

    // This worker is blocked because the script does not exist.
    try {
      var nonexisting_worker = new Worker('nonexisting_worker.js');
      nonexisting_worker.onerror = function (event) {
        ++worker_onerror_count;
        console.log(event.message);
        if (event.message.includes('nonexisting_worker.js')) {
          assertIncludes('aborted or failed with code 404', event.message);
          assertIncludes('/testdata/nonexisting_worker.js', event.filename);
        } else {
          notReached();
        }
        if (worker_onerror_count == 1) {
          window.setTimeout(
            () => {
              assertEqual(1, worker_onerror_count);
              assertEqual(0, window_onerror_count);
              onEndTest();
            }, 250);

        }
      };
    } catch (error) {
      // The error is thrown asynchronously after the Worker constructor.
      notReached();
    }
  </script>
</body>