Mockito mocked function returned Null

Issue I got stuck on making the test using Mockito. I’m trying to implement Clean Architect to the Flutter tutorial https://docs.flutter.dev/get-started/codelab. I’ve made a use case called GetRandomWords and an interface-adapter called RandomWordsRepository like so: abstract class RandomWordsRepository { String

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'Null' is not a subtype of type 'Future<Either<Failure, NumberTrivia>>'

Issue I am implementing the flutter project in TDD Clean Architecture by following this video: https://www.youtube.com/watch?v=lPkWX8xFthE&t=1s my code: class MockNumberTriviaRepository extends Mock implements NumberTriviaRepository {} void main() { late MockNumberTriviaRepository mockNumberTriviaRepository; late GetConcreteNumberTrivia usecase; setUp(() { mockNumberTriviaRepository = MockNumberTriviaRepository(); usecase

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