code: def test_missing_labels_error(art_warning, tabular_batch):
      try:
          test_input = tabular_batch
          mixup = MixupTensorFlowV2(num_classes=10)
  
          exc_msg = "Labels `y` cannot be None."
          with pytest.raises(ValueError, match=exc_msg):
              mixup(test_input)
      except ARTTestException as e:
          art_warning(e)
  
file_path: adversarial-robustness-toolbox/tests/defences/preprocessor/mixup/test_mixup_tensorflow.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import logging
  import numpy
  import pytest
  from numpy.testing import assert_array_equal, assert_array_almost_equal
  from art.config import ART_NUMPY_DTYPE
  from art.defences.preprocessor import MixupTensorFlowV2
  from tests.utils import ARTTestException
label_desc: Use image node_id 5 for calling a global function with example usage: test_missing_labels_error(art_warning, tabular_batch) without return types