CoroutinesFlowTest.kt

    @Test
    fun myTest() = coroutineDispatcher.runBlockingTest {

       val uc = GetPicturesUseCase(MyFakeRepository())
       val item =  uc.invoke().first()
       assert(item is ResultData.Failure)
       
    }
    
    
    class MyFakeRepository : FilesRepository {
    override fun getPictures(): Flow<ResultData<String>> = flow {
        emit(ResultData.Success("a"))
    }
}