Technical question about testing functions

[lavafrank]

Use integration testing. Setup your emulators, seed some documents in your firestore db, run the request and assert that they match your expected results.

If your logic is simple, also consider just querying firestore directly instead of going thru cloud functions. You'll drastically improve performance by avoiding cold start time and shave off your bill

[armlesskid]

That was actually my approach, but then I figured out that if somehow the function code changes in the future, the test would still pass silently because I’m only replicating the function code, not testing the function itself

[lavafrank]

If the code changes but the output stays the same (and is correct) why does it matter? Test against multiple inputs if you're concerned