If you have a developer account, and an app registered, you can add test users (virtual or real ppl). The virtual test users have their own email and password, and they work as a regular user.
As for dummy data, I don’t know what the api’s look like, so I cannot give advice there.
i work with the instant game with test user in local pc. it was working find. suddenly it occurred error when connect with the facebook .now test app not working on local pc but it is working on facebook hosting.have you any idea for that issue.