code: def test_extract(self):
      X, y = load_data_and_labels(self.filename)
      self.assertTrue(len(X) == len(y))
  
file_path: anago/tests/test_utils.py
imports: import os
  import unittest
  from anago.utils import load_data_and_labels, Vocabulary, download, NERSequence
  from anago.preprocessing import IndexTransformer
label_desc: Use image node_id 2 for calling the TestUtils obj's underlying member method code with example usage: obj.test_extract() without return types