Are there open test accounts available for common OAuth2 providers?

I am using passport.js as back-end library To handle authentication from OAuth providers like google, Facebook and Twitter.

As I am now writing the tests I would like to avoid creating own accounts just for testing.

So are there something like open credentials for the used providers?

How do yo mockup the accounts in tests?

See http://term.ie/oauth/example with the explanation on this other post