Connection error

Hello, flutter_vpn team. I want to implement vpn in my flutter project. 
Can i test it with dummy server and username?
 
ElevatedButton(
              child: const Text('Connect'),
              onPressed: () => FlutterVpn.connectIkev2EAP(
                server: "",
                username: "",
                password: "",
              ),
            ),
            
           