<!DOCTYPE html>
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  Copyright 2023 The Cobalt Authors. All Rights Reserved.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
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      http://www.apache.org/licenses/LICENSE-2.0

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<html>
<head>
  <title>Cobalt Service Worker Fetch Main Resource</title>
  <script src='black_box_js_test_utils.js'></script>
</head>
<body>
  <script>
    const unregisterAll = () => navigator.serviceWorker.getRegistrations().then(registrations =>
        Promise.all(registrations.map(r => r.unregister())));
    const fail = msg => {
      if (msg) {
        console.error(msg);
      }
      unregisterAll().then(notReached);
    };
    const success = () => unregisterAll().then(() => {
      clearTimeout(timeoutId);
      onEndTest();
    });
    const assertEquals = (expected, actual, msg) => {
      if (expected === actual) {
        return;
      }
      const errorMessage = `Expected: '${expected}', but was '${actual}'`;
      fail(msg ? `${msg}(${errorMessage})` : errorMessage);
    };
    const timeoutId = window.setTimeout(fail, 5000);
    navigator.serviceWorker.onmessage = event => {
      const requests = event.data;
      assertEquals(2, requests.length);
      // The sub resource is black_box_js_test_utils.js.
      const [mainResourceRequest, subResourceRequest] = requests;
      assertEquals('navigate', mainResourceRequest.mode);
      assertEquals('cors', subResourceRequest.mode);
      success();
    };

    navigator.serviceWorker.getRegistration().then(registration => {
      if (!registration || !registration.active) {
        fail('Expected active registration, but none present.');
      }
      registration.active.postMessage('start');
    });

    setupFinished();
  </script>
</body>
</html>