Mojo JS validation unit test should check Connection et al

mojo/public/js/bindings/connection.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 define("mojo/public/js/bindings/connection", [
+  "mojo/public/js/bindings/connector",
   "mojo/public/js/bindings/router",
-], function(router) {
+], function(connector, router) {
 
-  function Connection(handle, localFactory, remoteFactory) {
-    this.router_ = new router.Router(handle);
+  function Connection(
+      handle, localFactory, remoteFactory, routerFactory, connectorFactory) {
+    if (routerFactory === undefined)
+      routerFactory = router.Router;
+    this.router_ = new routerFactory(handle, connectorFactory);
     this.remote = new remoteFactory(this.router_);
     this.local = new localFactory(this.remote);
     this.router_.setIncomingReceiver(this.local);
 
     var validateRequest = localFactory.prototype.validator;
     var validateResponse = remoteFactory.prototype.validator;
     var payloadValidators = [];
     if (validateRequest)
       payloadValidators.push(validateRequest);
     if (validateResponse)
       payloadValidators.push(validateResponse);
     this.router_.setPayloadValidators(payloadValidators);
   }
 
   Connection.prototype.close = function() {
     this.router_.close();
     this.router_ = null;
     this.local = null;
     this.remote = null;
   };
 
   Connection.prototype.encounteredError = function() {
     return this.router_.encounteredError();
   };
 
+  // The TestConnection subclass is only intended to be used in unit tests.
+
+  function TestConnection(handle, localFactory, remoteFactory) {
+    Connection.call(this,
+                    handle,
+                    localFactory,
+                    remoteFactory,
+                    router.TestRouter,
+                    connector.TestConnector);
+  }
+
+  TestConnection.prototype = Object.create(Connection.prototype);
+
   var exports = {};
   exports.Connection = Connection;
+  exports.TestConnection = TestConnection;
   return exports;
 });