text: 'use strict'
  
  // Depends on /serviceworker/resources/test-helpers.js
  async function registerAndActivateServiceWorker(test) {
      const script = '/resources/empty-worker.js';
      const scope = '/resources/scope' + location.pathname;
      const serviceWorkerRegistration =
          await service_worker_unregister_and_register(test, script, scope);
      add_completion_callback(() => serviceWorkerRegistration.unregister());
      await wait_for_state(test, serviceWorkerRegistration.installing, 'activated');
      return serviceWorkerRegistration;
  }
  