code: def test_list_length(self):
      self.assertEqual(10, list_length(list(range(10))))
  
file_path: small-text/tests/unit/small_text/utils/test_data.py
imports: import unittest
  import numpy
  from scipy.sparse import csr_matrix
  from small_text.base import LABEL_UNLABELED
  from small_text.utils.data import check_training_data, list_length
  from tests.utils.datasets import random_sklearn_dataset
label_desc: Use image node_id 1 for calling the DataUtilsTest obj's underlying member method code with example usage: obj.test_list_length() without return types