Import wpt@503f5b5f78ec4e87d144f78609f363f0ed0ea8db

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/test-helpers.sub.js

 // Adapter for testharness.js-style tests with Service Workers
 
 function service_worker_unregister_and_register(test, url, scope) {
   if (!scope || scope.length == 0)
     return Promise.reject(new Error('tests must define a scope'));
 
   var options = { scope: scope };
   return service_worker_unregister(test, scope)
     .then(function() {
         return navigator.serviceWorker.register(url, options);
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       assert_unreached(error_prefix + ': ' + reason);
     });
 }
 
 // Adds an iframe to the document and returns a promise that resolves to the
 // iframe when it finishes loading. The caller is responsible for removing the
 // iframe later if needed.
 function with_iframe(url) {
   return new Promise(function(resolve) {
       var frame = document.createElement('iframe');
+      frame.className = 'test-iframe';
       frame.src = url;
       frame.onload = function() { resolve(frame); };
       document.body.appendChild(frame);
     });
 }
 
 function normalizeURL(url) {
   return new URL(url, self.location).toString().replace(/#.*$/, '');
 }
 
@@ skipping 153 matching lines @@
       });
 }
 
 function websocket(test, frame) {
   return test_websocket(test, frame, get_websocket_url());
 }
 
 function get_websocket_url() {
   return 'wss://{{host}}:{{ports[wss][0]}}/echo';
 }