/callback endpoint providing the code from Google OAuth Playground based on this Cypress guide, but got stuck with mocking state because i'm not sure where or how in the source code its being set.session and/or verification table with a mockedSession and then mocking the cookie. I need some help here, im not sure exactly what im doing.better-auth.session_token and the value format issessionToken.BETTER_AUTH_SECRET and then i believe it also needs to be serialized or something. Not sure exactly how to achieve these steps.