text: importScripts('../../resources/test-helpers.sub.js');
  importScripts('../../resources/worker-testharness.js');
  
  var events_seen = [];
  
  self.registration.addEventListener('updatefound', function() {
      events_seen.push('updatefound');
    });
  
  self.addEventListener('activate', function(e) {
      events_seen.push('activate');
    });
  
  self.addEventListener('fetch', function(e) {
      events_seen.push('fetch');
      e.respondWith(new Response(events_seen));
    });
  
  self.addEventListener('message', function(e) {
      events_seen.push('message');
      self.registration.update();
    });
  
  // update() during the script evaluation should be ignored.
  self.registration.update();
  