Mocking a Riverpod-generated AutoDisposeNotifier results in ...has no instance method '_setElement'.

[derolf]

I have a Notifier:

@riverpod
class Foo extends _$Foo {
...
}

I am mocking it with mocktail:

class MockFoo extends Mock implements Foo {}

Supplying is at an override yields this error:

class 'MockFoo' has no instance method '_setElement'.
Receiver: Instance of 'MockFoo'
Tried calling: _setElement(Instance of 'AutoDisposeNotifierProviderElement<Foo, FooState>')

What should I do?

[rrousselGit]

extends Foo with Mock

[derolf]

extends Foo with Mock

That exposes all methods from Foo which I want to "hide".

[derolf]

This works:

class MockFoo extends AutoDisposeNotifier<Bar> with Mock implements Foo {
}

[vdmytrovskyi-hpe]

Holly cow! How can someone come up with this?
Thank you for your answer!

[Takrem1]

Hey i have the same Problem, but the solution above does not work for me.

With the Line:

class MockMyController extends AutoDisposeNotifier<MyModel> with Mock implements MyController {}

i get this Error:

Superinterfaces don't have a valid override for 'build': AutoDisposeNotifier.build (MyModel Function()), MyController.build (MyModel Function(group)).

Both of the classes (AutoDisposeNotifier and MyController) have a build() method. I tried to override both of them, but this was not possible for me. Any Suggestions how to solve this Problem?

This is my Code:

class MockGroup extends Mock implements Group {}
// next line has the error
class MockMyController extends AutoDisposeNotifier<MyModel> with Mock implements MyController {}

void main() {
  group('widget test group', () {
    testWidgets('test', (tester) async {
      final mockGroup = MockGroup();
      final mockMyController = MockMyController();

      await tester.pumpWidget(
        ProviderScope(
          overrides: [
            // myControllerProvider has the type MyControllerFamily. I get the specific MyControllerProvider with the group-parameter
            myControllerProvider(mockGroup).overrideWith(() => mockMyController),
          ],
          child: MaterialApp(
            home: Scaffold(body: TestWidget),
          ),
        ),
      );
    });
  });
}

[Randomguy01]

I had the same issue and fixed it by changing AutoDisposeNotifier<MyModel> to AutoDisposeFamilyNotifier<MyModel, arg> where arg was the type passed to the family modifier.

[tomdittrich]

Your tip has brought me a little further. However, I still get an error message when I try to read the provider:

type ‘(MyArg)’ is not a subtype of type ‘MyArg’ in type cast

MyArg is the type passed to the family modifier.

[tazik561]

extends AutoDisposeNotifier

how did you return state ?