Add lookupController to test_utils

Author: dgeb

test/javascripts/test_utils.js

@@ -1,10 +1,14 @@
 var lookupStore = function() {
   return App.__container__.lookup('store:main');
-}
+};
 
 var lookupRouter = function() {
   return App.__container__.lookup('router:main');
-}
+};
+
+var lookupController = function(controllerName, options) {
+  return App.__container__.lookup('controller:' + controllerName, options);
+};
 
 var appendView = function(view) {
   Ember.run(function() {