Having issue testing with Stacked

[MirzaCickusic]

I have this test failing:

void main() {
SettingsViewModel getModel() => SettingsViewModel();
group('SettingsViewModel Tests -', () {
setUp(() => registerServices());
tearDown(() => locator.reset());
test('Given theme mode, when updateThemeMode is called, should update and rebuild UI', () async {
final model = getModel();
final settingsService = getAndRegisterSettingsService();
const newThemeMode = ThemeMode.dark;
await model.updateThemeMode(newThemeMode);
verify(settingsService.updateThemeMode(newThemeMode));
expect(model.themeMode, newThemeMode);
});
});
}

Error: No matching calls (actually, no calls at all).

But its clear that test should pass. Here is the view model where the function is called:

class SettingsViewModel extends BaseViewModel {
final SettingsService _settingsService = locator<SettingsService>();
ThemeMode get themeMode => _settingsService.themeMode;
Locale get locale => _settingsService.locale;
Future<void> updateThemeMode(ThemeMode? newThemeMode) async {
if (newThemeMode == null) return;
await _settingsService.updateThemeMode(newThemeMode);
rebuildUi();
}
Future<void> setLocale(Locale? newLocale) async {
if (newLocale == null) return;
await _settingsService.updateLocale(newLocale);
rebuildUi();
}
}

I really think there is issue with an underling auto generated code to mock the SettingsService and its function. Which looks like this:

[u/GenerateMocks](https://www.reddit.com/u/GenerateMocks/)([], customMocks: [
MockSpec<NavigationService>(onMissingStub: OnMissingStub.returnDefault),
MockSpec<BottomSheetService>(onMissingStub: OnMissingStub.returnDefault),
MockSpec<DialogService>(onMissingStub: OnMissingStub.returnDefault),
MockSpec<SettingsService>(onMissingStub: OnMissingStub.returnDefault),
// [u/stacked-mock-spec](https://www.reddit.com/u/stacked-mock-spec/)
])
void registerServices() {
getAndRegisterNavigationService();
getAndRegisterBottomSheetService();
getAndRegisterDialogService();
getAndRegisterSettingsService();
// [u/stacked-mock-registe](https://www.reddit.com/u/stacked-mock-registe/)

MockSettingsService getAndRegisterSettingsService() {
_removeRegistrationIfExists<SettingsService>();
final service = MockSettingsService();
locator.registerSingleton<SettingsService>(service);
return service;
}
}

@override
  _i6.Future<void> updateThemeMode(_i5.ThemeMode? newThemeMode) =>
      (super.noSuchMethod(
        Invocation.method(
          #updateThemeMode,
          [newThemeMode],
        ),
        returnValue: _i6.Future<void>.value(),
        returnValueForMissingStub: _i6.Future<void>.value(),
      ) as _i6.Future<void>);
      ```