how to make Unit Test Paging3 Kotlin in my file project test case MovieViewModelTest.kt, I don't know how implement it?

MovieViewModelTest.kt

@RunWith(MockitoJUnitRunner::class)
class MovieViewModelTest {
    private lateinit var viewModel: MovieViewModel
    @get:Rule
    var instantTaskExecutorRule = InstantTaskExecutorRule()
    @Mock
    private lateinit var filmRepository: FilmRepository
    @Mock
    private lateinit var savedStateHandle: SavedStateHandle
    @Mock
    private lateinit var observer: Observer<in PagingData<Film>>
    @Mock
    private lateinit var pagingData: PagingData<Film>
    @Before
    fun setUp() {
        viewModel = MovieViewModel(filmRepository, savedStateHandle)
    }
    @Test
    fun getListMovie() {
        //??how implement unit test paging 3 here??
        ......
    }
}

CodePudding user response：

This from my project MovieViewModel.kt

class MovieViewModel @ViewModelInject constructor(
    repository: FilmRepository,
    @Assisted state: SavedStateHandle
) : ViewModel() {

    private val currentQuery = state.getLiveData(CURRENT_QUERY, EMPTY_QUERY)

    val movies = currentQuery.switchMap { query ->
        if (query.isNotEmpty()) {
            repository.getSearchMovies(query).cachedIn(viewModelScope)
        } else {
            repository.getNowPlaying().cachedIn(viewModelScope)
        }
    }

    fun searchMovies(query: String) {
        currentQuery.value = query
    }

    companion object {
        private const val CURRENT_QUERY = "current_query"
        private const val EMPTY_QUERY = ""
    }
}

CodePudding user response：

This from my project FilmRepository.kt

@Singleton
class FilmRepository @Inject constructor(private val apiService: ApiService) {

    private val remoteDataSource = RemoteDataSource

    fun getNowPlaying() =
        Pager(
            config = PagingConfig(
                pageSize = 5,
                maxSize = 20,
                enablePlaceholders = false
            ),
            pagingSourceFactory = { MoviePagingSource(apiService, null) }
        ).liveData

    fun getSearchMovies(query: String) =
        Pager(
            config = PagingConfig(
                pageSize = 5,
                maxSize = 20,
                enablePlaceholders = false
            ),
            pagingSourceFactory = { MoviePagingSource(apiService, query) }
        ).liveData
}