added test for address and updated addrs to return real conn address

nats.go

@@ -55,9 +55,13 @@ func (n *subscriber) Unsubscribe() error {
 }
 
 func (n *nbroker) Address() string {
+	if n.conn != nil && n.conn.IsConnected() {
+		return n.conn.ConnectedUrl()
+	}
 	if len(n.addrs) > 0 {
 		return n.addrs[0]
 	}
+
 	return ""
 }