Change karma config to single run

karma.conf.js

@@ -26,7 +26,8 @@ module.exports = function (config) {
     logLevel: config.LOG_INFO,
     autoWatch: true,
     browsers: ['Chrome'],
-    singleRun: false,
-    restartOnFileChange: true
+    singleRun: true,
+    restartOnFileChange: true,
+    usePolling: true
   });
 };