Recommended changes made.

Author: yasirfolio3

OptimizelySDK/Implementation/DefaultNotificationCenter.swift

@@ -157,5 +157,12 @@ public class DefaultNotificationCenter : OPTNotificationCenter {
         }
     }
 
-    
+    public func getArgumentsForDecisionListener(notificationType: String, userId: String, attributes: OptimizelyAttributes?) -> Array<Any?> {
+        var args = Array<Any?>()
+        args.append(notificationType)
+        args.append(userId)
+        args.append(attributes ?? OptimizelyAttributes())
+        return args
+    }
+
 }

OptimizelySDK/Optimizely/OptimizelyManager.swift

@@ -323,11 +323,9 @@ open class OptimizelyManager: NSObject {
         guard let experiment = config.getExperiment(key: experimentKey) else {
             throw OptimizelyError.experimentUnknown
         }
-        
-        var args = Array<Any?>()
-        args.append(Constants.DecisionTypeKeys.experiment)
-        args.append(userId)
-        args.append(attributes ?? OptimizelyAttributes())
+    
+        var args: Array<Any?> = (self.notificationCenter as! DefaultNotificationCenter).getArgumentsForDecisionListener(notificationType: Constants.DecisionTypeKeys.experiment, userId: userId, attributes: attributes)
+
         var decisionInfo = Dictionary<String,Any>()
         decisionInfo[Constants.NotificationKeys.experiment] = nil
         decisionInfo[Constants.NotificationKeys.variation] = nil