'Object.==' ('bool Function(Object)')

[radvansky-tomas]

I see this a lot when I am trying to mock firebase libs:

'Object.==' ('bool Function(Object)') isn't a valid concrete implementation of 'Reference.==' ('bool Function(Object?)').

And thats because of their:

 @override
  bool operator ==(Object? other) =>
      other is Reference &&
      other.fullPath == fullPath &&
      other.storage == storage;

Any idea how to use generator for such thing ?

[srawlins]

Oooh yikes. That's not great. Object.== indeed accepts a non-nullable Object as an argument. It is a bit strange that Reference would expand that parameter type to be Object?. I don't think we can or perhaps should support mocking classes which change the types of Object's method parameters...

[radvansky-tomas]

Thats not only reference, there are plenty classes under flutter fire, which has same issue this is documentReference:

  @override
  // ignore: avoid_equals_and_hash_code_on_mutable_classes
  bool operator ==(dynamic other) =>
      other is DocumentReference &&
      other.firestore == firestore &&
      other.path == path;

A saw more with storage, etc..

[srawlins]

I suggest opening bugs against those packages, perhaps asking why they expanded the parameter type on the == operator. It may be accidental.

[srawlins]

This should be fixed in mockito 5.0.10.

[MoustafaMesbah]

issue still existed in mockito 5.0.10

[cedvdb]

on 5.0.14 it is an issue when trying to mock just_audio AudioPlayer

[Samin-youki]

@srawlins any update on this?
the issue exist on version 5.0.15
'Object.==' ('bool Function(Object)') isn't a valid concrete implementation of 'EtherAmount.==' ('bool Function(dynamic)')
trying to mock the web3dart client.

[ihorvitruk]

@srawlins I have the same issue with google_sign_in plugin.

 class MockGoogleSignInAccount_ extends _i1.Mock 'Mock.==' ('bool Function(Object)') isn't a valid concrete implementation of
                                                    'GoogleSignInAccount.==' ('bool Function(dynamic)'). #invalid_implementation_override

This is because == operator takes dynamic argument for GoogleSignInAccount class:

@override
  bool operator ==(dynamic other) {
    ...

Insight: It (generated mock) used to work until I performed migration of the package to null-safety.

@Samin-youki The workaround is to temporarily use stub for your EtherAmount with override == and hashCode:

class _TestEtherAmount implements EtherAmount {
 @override
  bool operator ==(dynamic other) => super == other;

  @override
  int get hashCode => super.hashCode;

  ...