Move savedDocument to its own class about fake_cloud_firestore

[atn832]

That works too!

[suztomo]

@atn832 How about adding underscore to the 3 methods?

identifiers that start with an underscore (_) are visible only inside the library.

https://dart.dev/guides/language/language-tour#libraries-and-visibility

[suztomo]

Initial attempt failed. It seems I need to know more about the notion of "library" in Dart. Symbols with "_" is not visible to other files.

Compiler message:
../lib/src/mock_collection_reference.dart:50:34: Error: The method '_hasSavedDocument' isn't defined for the
class 'MockFirestoreInstance'.
 - 'MockFirestoreInstance' is from 'package:cloud_firestore_mocks/src/cloud_firestore_mocks_base.dart'
 ('../lib/src/cloud_firestore_mocks_base.dart').
Try correcting the name to the name of an existing method, or defining a method named '_hasSavedDocument'.
                      _firestore._hasSavedDocument(documentReference.path));
                                 ^^^^^^^^^^^^^^^^^

suztomo@0f651a8