fetchMovieDiscover_test_success_with_empty.kt

  private fun mockFetchMovieDiscover(block: SingleEmitter<MovieDiscoveryResponse>.() -> Unit) {
    `when`(dataProvider.getMovieDiscover()).thenReturn(Single.create { e -> e.block() })
  }
  
  @Test
  fun fetchMovieDiscover_test_success_with_empty() {
    mockFetchMovieDiscover { onSuccess(emptyList()) }

    viewModel.fetchMovieDiscover()

    verify(observer).onChanged(LoadingState())
    verify(observer).onChanged(EmptyState())
  }