Supabase and Firebase are the go-to backend platforms for AI-assisted development. Their managed auth, real-time databases, and serverless functions let developers ship full-stack applications without managing infrastructure.
But the managed nature creates unique testing challenges. The auth system is a black box. The database has real-time subscriptions hard to test deterministically. Edge functions run in environments that differ from local setup.
Authentication Testing
What to test: sign up flow, login with valid/invalid credentials, password reset, session persistence, token expiry handling, OAuth flows, and Row-Level Security policies.
The tricky part: testing auth flows end-to-end requires real accounts and sessions. Mocking the SDK misses integration bugs. Testing against the real platform catches them.
TestSprite tests auth flows against your deployed application, interacting with real Supabase/Firebase auth. It creates test sessions, verifies protected route access, and checks unauthorized access is blocked.
Database and RLS Testing
Supabase's Row-Level Security and Firebase's Security Rules are the authorization layer. A misconfigured RLS policy can expose user data — and AI coding tools are prone to generating incomplete RLS policies.
What to test: User A cannot read User B's data. Unauthenticated requests rejected for protected tables. Write permissions correctly scoped. Admin operations restricted.
TestSprite's security testing automatically checks authorization boundaries, catching IDOR vulnerabilities and permission misconfigurations.
Edge Functions / Cloud Functions
Serverless functions handle business logic on the server. Often generated by AI and deployed without testing.
What to test: valid input handling, error responses for invalid inputs, authentication enforcement, timeout handling, and no sensitive data leakage in errors.
TestSprite tests edge functions as part of the full-stack suite, calling them through your API layer and verifying both function behavior and the app's response handling.
For Supabase and Firebase developers building with AI, automated testing catches platform integration bugs local dev misses. Free tier includes everything.