[Flutter] I don't know the value returned to me when testing bloc in Flutter

Im developing an app on Flutter. I want to test bloc using mockito but I don't know response. (status code:200 but response is a very big and dynamic model)

I read the same example in every source, I don't understand. Please help me, Thank you.

blocTest<DataBloc, DataState>(
'emits [loading, data] when API call is successful',
build: () {
when(mockApiService.get(any)).thenAnswer(
(_) async => http.Response('{"data": "sample data"}', 200),
);
return dataBloc;
},
act: (bloc) => bloc.add(FetchDataEvent()),
expect: () => [
DataState(loading: true), // İlk loading durumu
DataState(data: '{"data": "sample data"}'), // Başarılı yanıt
],
);

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