init_test.kt

  @Mock
  private lateinit var dataProvider: DataProvider
  @Mock lateinit var observer: Observer<ResourceState<List<Movie>>>
  private lateinit var viewModel: MovieListViewModel

  @Before
  fun init() {
    MockitoAnnotations.initMocks(this)
    viewModel = MovieListViewModel(dataProvider)
      .apply { movieDiscover.observeForever(observer) }
  }