Angular how to unit test Firebase (v19)

In my Angular application I wrapped the connection to the store in a service but I can't test it.

In the main documentation is written:

firestore: Firestore = inject(Firestore);

getItemsCollection() {
const itemCollection = collection(this.firestore, 'items');
return collectionData<Item>(itemCollection);
}

getItemsCollection(id: string) {
const itemDocument = doc(this.firestore, 'items' + id);
return docData<Item>(itemDocument);
}


but how can i test it? I'm expecting to provide "Firestore" using a spy object or something mocked but how can i do it that could work also for other document/collection action (as update/add/delete)

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