code: def test_iterator_empty_directory():
      # Testing with different batch sizes
      for batch_size in [0, 32]:
          data_iterator = iterator.Iterator(0, batch_size, False, 0)
          ret = next(data_iterator.index_generator)
          assert ret.size == 0
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_iterator_empty_directory() without return types