collectionGroup(..).snapshots().listen(..) callback is never called for me

[peterfortuin]

I have a collectionGroup query and I want to listen to the snapshots. This seems to work fine the real Firestore, but not with the FakeFirebaseFirestore. Is this supported by the library?

This is my production code:

_firestore
  .collectionGroup('running-games')
  .withConverter(
    fromFirestore: RunningGame.fromFirestore,
    toFirestore: (RunningGame runningGame, options) =>
      runningGame.toFirestore(),
  )
  .snapshots()
  .listen((event) {
    print("listener called");
  });

And my test is adding the required items to the Fake Firestore:

var gameRef = await firestore.collection("games").add({
  "name": "Test game",
  "owner": "user",
});

await gameRef.collection("running-games").add({
  "state": "startup",
  "owner": "user",
});

I verified that the data is there with the dump method:

{
  "games": {
    "ORYf4LUNgSxyAWAn28f2": {
      "running-games": {
        "LNua2z1BlVZenX8tdVNt": {
          "state": "startup",
          "owner": "user"
        }
      },
      "name": "Test game",
      "owner": "user"
    }
  }
}

But the listener that should print "listener called" is never called. Is this not supported or is this a bug in the library? Or do I make a mistake somewhere?

[atn832]

The firing mechanism in our library is a bit complicated. So it was probably never implemented. If you manage to make it work, I'll happily review a PR.