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const fakePushEvent = new PushEvent('push', {
  data: JSON.stringify(pushData),
});

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self.addEventListener('message', (event) => {
  if (event.data !== 'run-tests') {
    return;
  }

  const runResults = mocha.run();
  runResults.on('end', () => {
    event.ports[0].postMessage({
      failures: runResults.failures,
      total: runResults.total,

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it('should run sw-unit-tests.js unit tests', function() {
  return navigator.serviceWorker.register('/test/sw/sw-unit-tests.js')
  .then((reg) => {
    return window.__waitForSWState(reg, 'activated');
  })
  .then((serviceWorker) => {
    return sendMessage(serviceWorker, 'run-tests');
  })
  .then((results) => {
    if (results.failures > 0) {

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const sendMessage = (serviceWorker, message) => {
  return new Promise(function(resolve, reject) {
    const messageChannel = new MessageChannel();
    messageChannel.port1.onmessage = function(event) {
      if (event.data.error) {
        reject(event.data.error);
      } else {
        resolve(event.data);
      }
    };

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importScripts('/node_modules/mocha/mocha.js');

mocha.setup({
  ui: 'bdd',
  reporter: null,
});

describe('First SW Test Suite', function() {
  it('should test something', function() {
    ...

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describe('Run SW Unit Tests', function() {
  beforeEach(function() {
    return window.__testCleanup();
  });

  after(function() {
    return window.__testCleanup();
  });

  it('should run sw-unit-tests.js unit tests', function() {

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<script src="/test/browser/run-sw-tests.js"></script>

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beforeEach(function() {
  return window.__testCleanup();
});

after(function() {
  return window.__testCleanup();
});

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<script src="/test/utils/sw-test-cleanup.js"></script>

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window.__testCleanup = () => {
  const unregisterSW = () => {
    return navigator.serviceWorker.getRegistrations()
    .then((registrations) => {
      const unregisterPromise = registrations.map((registration) => {
        return registration.unregister();
      });
      return Promise.all(unregisterPromise);
    });
  };