diff --git a/karma.conf.js b/karma.conf.js
index 1f36224..d183eb8 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -5,8 +5,9 @@ module.exports = function(config) {
     files: [
       'node_modules/angular/angular.js',
       'node_modules/angular-mocks/angular-mocks.js',
+      'node_modules/phantomjs-polyfill/bind-polyfill.js',
       'src/**/*.js',
-      'test/**/*.js'
+      'test/**/*.spec.js'
     ],
     preprocessors: {
       'src/**/*.js': 'babel',
diff --git a/package.json b/package.json
index cf2c25c..71b0163 100644
--- a/package.json
+++ b/package.json
@@ -50,6 +50,7 @@
     "karma-phantomjs-launcher": "^0.2.1",
     "mocha": "^2.2.5",
     "phantomjs": "^1.9.18",
+    "phantomjs-polyfill": "0.0.1",
     "sinon-chai": "^2.8.0"
   }
 }
diff --git a/test/uiMentionController.spec.js b/test/uiMentionController.spec.js
index b9e0238..b8d3533 100644
--- a/test/uiMentionController.spec.js
+++ b/test/uiMentionController.spec.js
@@ -487,13 +487,9 @@ describe('uiMentionController', () => {
     function trigger (el, ev, code) {
       let evt;
 
-      if (code) {
-        evt = $document[0].createEvent('KeyboardEvent');
-        evt.initKeyboardEvent(ev, true, true);
-        evt.keyCode = code;
-      } else {
-        evt = new Event(ev);
-      }
+      evt = $document[0].createEvent('KeyboardEvent');
+      evt.initKeyboardEvent(ev, true, true);
+      evt.keyCode = code;
 
       el[0].dispatchEvent(evt);