code: def test_columns__when_empty(self):
      batch = _BatchInAugmentation()
      assert len(batch.columns) == 0
  
imports: from __future__ import print_function, division, absolute_import
  import warnings
  import sys
  import numpy
  import imgaug
  import imgaug.augmenters
  from imgaug.testutils import reseed
  from imgaug.augmentables.batches import _BatchInAugmentation
label_desc: Use image node_id 7 for calling the Test_BatchInAugmentation obj's underlying member method code with example usage: obj.test_columns__when_empty() without return types