[ERROR: Bad state] Mocking response with when() about fake_cloud_firestore

[suztomo]

(I'm not author of this library) This library is becoming more "fake" than "mock". To prepare database that contain some data, you need to populate it.

mockFirestoreInstance.collection("users").add({"name": "suztomo"});

If you just need a mock, using mockito (without cloud_firestore_mocks) should suffice.

@atn832 In document, you may want to clarify which parts are "fake" and what are "mock". (I believe this library is a "fake", and fake is suitable for my usage)
Difference between fake and mock: https://blog.pragmatists.com/test-doubles-fakes-mocks-and-stubs-1a7491dfa3da

[atn832]

You're right, calling the library mocks is a misnomer. It was true initially since everything extended Mock and implementation was minimal. I've filed #33 and #34. I'll see if #34 is doable.

Closing this since the workaround is to populate the fake db like @suztomo mentioned.