CODEWITHSUNDEEP
flutterflutter-mockito
Anthony Rodriguez
Anthony Rodriguez

Reputation: 21

How to test Either from bloctest

I use this library fpdart with Bloc for State Management. From fpDart I'm just using Either to manage errors. But now, when I'm doing my unit test for the Bloc I call a funcion that looks like this

Future<Either<Failure, List<Anime>>> getPopularAnime();

When I run this test:

group('⭐️ When [Started] is added.  ', () {
    Failure failure = Failure.badRequest();
    final failureEither = Either<Failure, List<Anime>>.left(failure);

    blocTest('emits [Loading,Error]',
        build: () => landingBloc,
        setUp: () {
          when(animeRepository.getPopularAnime())
              .thenAnswer((_) async => failureEither);
        },
        act: (bloc) => bloc.add(const LandingEvent.started()),
        expect: () => [
              const LandingState.loading(),
              LandingState.error(failure),
            ]);
  });

The animeRepository that is in the code is a Mock generated by @GenerateNiceMocks([MockSpec<AnimeRepository>()])

Mockito says this

MissingDummyValueError: Either<Failure, List<Anime>> This means Mockito was not smart enough to generate a dummy value of type 'Either<Failure, List<Anime>>'. Please consider using either 'provideDummy' or 'provideDummyBuilder' functions to give Mockito a proper dummy value.

I expect when the bloc calls animeRepository.getPopularAnime() it returns Either<Failure, List<Anime>> because the bloc emits error in case of Left or emits success in case of right.

Upvotes: 2

Views: 439

Answers (0)

Related Questions