code: def test_numbers(self):
      label = validate_label_eng("this is a 1 2 3 test")
      self.assertEqual(label, None)
  
file_path: DeepSpeech/tests/test_importers.py
imports: import unittest
  from argparse import Namespace
  from deepspeech_training.util.importers import validate_label_eng, get_validate_label
  from pathlib import Path
label_desc: Use image node_id 1 for calling the TestValidateLabelEng obj's underlying member method code with example usage: obj.test_numbers() without return types