Streams Implementation Update: async read

LayoutTests/http/tests/serviceworker/resources/test-helpers.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);
       })
     .catch(unreached_rejection(test,
                                'unregister and register should not fail'));
 }
 
 function service_worker_unregister(test, documentUrl) {
   return navigator.serviceWorker.getRegistration(documentUrl)
     .then(function(registration) {
         if (registration)
           return registration.unregister();
       })
     .catch(unreached_rejection(test, 'unregister should not fail'));
 }
 
 function service_worker_unregister_and_done(test, scope) {
   return service_worker_unregister(test, scope)
     .then(test.done.bind(test));
 }
 
+function unreached_fulfillment(test, prefix) {
+  return test.step_func(function(result) {
+      var error_prefix = prefix || 'unexpected fulfillment';
+      assert_unreached(error_prefix + ': ' + result);
+    });
+}
+
 // Rejection-specific helper that provides more details
 function unreached_rejection(test, prefix) {
   return test.step_func(function(error) {
       var reason = error.message || error.name || error;
       var error_prefix = prefix || 'unexpected rejection';
       assert_unreached(error_prefix + ': ' + reason);
     });
 }
 
 // Adds an iframe to the document and returns a promise that resolves to the
@@ skipping 166 matching lines @@
 }
 
 function login_https(test) {
   return test_login(test, 'https://127.0.0.1:8443',
                     'username1s', 'password1s', 'cookie1')
     .then(function() {
         return test_login(test, 'https://localhost:8443',
                           'username2s', 'password2s', 'cookie2');
       });
 }