test events for button / ui binding

src/moto/broker.js

@@ -50,8 +50,8 @@ class Broker {
     // return function bound to a topic
     bind(topic, message, options) {
         let broker = this;
-        return function(msg = message, opt = options) {
-            broker.publish(topic, msg, opt);
+        return function(msg, opt) {
+            broker.publish(topic, message || msg, options || opt);
         }
     }
 }