Hi Akash,
I do not have any test FAN banner ads that I can provide you. Also, apart from importing the FANs Adaptor and SDK, there is nothing else that you would have to do. Just make sure that you have properly added FAN as Mediation network for your Ad Unit ID and the follow the steps in the earlier mentioned FAN guidelines.
You can give us your Ad Unit ID and we will help you with any further queries. Also, here is a
sample app that you can use. Make sure to add your Ad Unit ID.