code: def test_get_column_names__only_images(self):
      batch = ia.UnnormalizedBatch(
          images=np.zeros((1, 2, 2, 3), dtype=np.uint8)
      )
  
      names = batch.get_column_names()
  
      assert names == ["images"]
  
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 2 for calling the TestUnnormalizedBatch obj's underlying member method code with example usage: obj.test_get_column_names__only_images() without return types