change for class so it has a default handler

index.js

@@ -5,13 +5,25 @@ const express = require("express");
 const bodyParser = require("body-parser");
 const fulfill = require("./lib/fulfilment");
 
-const onUserSignedInHandlerProvider = {
-  registerHandler: (handler) => this.handler = handler,
-  getHandler: () => this.handler,
-};
+class OnUserSignedInHandlerProvider {
+  constructor() {
+    this.handler = (user) => {
+      return Promise.resolve(user)
+    }
+  }
+
+  registerHandler(handler) {
+    this.handler = handler
+  }
+
+  getHandler() {
+    return this.handler
+  }
+}
 
 
 module.exports = (directlineSecret, conversationTimeout, shouldGetUsersNameFromGoogle = true) => {
+  const onUserSignedInHandlerProvider = new OnUserSignedInHandlerProvider();
   const router = express.Router();
   router.use(bodyParser.json());
   router.use(fulfill(directlineSecret, onUserSignedInHandlerProvider, conversationTimeout, shouldGetUsersNameFromGoogle));