Mockito cannot mock/spy because : - final class

Question

I am a simple function getCreditReport in viewmodel in which I am trying to make an API call repository layer I want to test getCreditReport in viewmodel to check that thge repository is called but I get the following error

   org.mockito.exceptions.base.MockitoException: 
Cannot mock/spy class com.example.clearscore.data.DataRepository
Mockito cannot mock/spy because :
 - final class

What I have tried

MainActivityViewModel

class MainActivityViewModel @Inject constructor(
    //private val retroServiceInterface: RetroServiceInterface,
    private val dataRepository: DataRepository
) : ViewModel() {
    var creditReportLiveData: MutableLiveData<CreditReport>

    init {
        creditReportLiveData = MutableLiveData()
    }

    fun getCreditReportObserver(): MutableLiveData<CreditReport> {
        return creditReportLiveData
    }

    fun getCreditReport() {
        viewModelScope.launch(Dispatchers.IO) {
            try {
                val response = dataRepository.getCreditReport()
                creditReportLiveData.postValue(response)
                Log.d("data", response.toString())
            } catch (e: IOException) {
                Log.d("data", e.toString())
            }
        }
    }
}

DataRepository

class DataRepository @Inject constructor(
        private val retroServiceInterface: RetroServiceInterface
) {

    suspend fun getCreditReport(): CreditReport {
        return retroServiceInterface.getDataFromApi()
    }
}

Unit test

@RunWith(MockitoJUnitRunner::class)
class MainActivityViewModelTest {
    @Mock
    private lateinit var dataRepository: DataRepository

    @Mock
    private lateinit var mainActivityViewModel: MainActivityViewModel

    @Test
    fun getCreditReport() {
        runBlocking {
            mainActivityViewModel.getCreditReport()
            verify(dataRepository).getCreditReport()
        }
    }
}

Dependency Injection component - in case this is helpful

@Singleton
@Component(modules = [RetroModule::class])
interface RetroComponent {

    fun inject(mainActivityViewModel: MainActivityViewModel)

    fun getMainactivityViewModel(): MainActivityViewModel
}

Please suggest what I am doing wrong

Thanks R

Answer 1

Please try adding this dependency

testImplementation "org.mockito:mockito-inline:3.11.2"