Our project mostly consists of Cloud Run instances, some of which wants to ask cloud firestore about stuff. To test this locally, I would like to run the emulator (maybe with login:ci) and the Cloud Run app in a local docker image. Can I at this point test it with no authentication, or mocked credentials created locally? It doesn't make sense to me that to test locally, I need to log into my Google accounts.

When I do

firebaseadmin.initializeApp()

the ADC is wanted.
And if I am able to initialize with a faked Credential (had to cheat a bit with the typescript setup), it fails on

firebaseadmin.firestore()

as it then tries to validate the signature of the credential.

Is there supposed to be a way to do something like this? The emulator running locally, the application running locally, and NOT being logged in to Google on any account whatsoever?