code: def load_tests(loader, tests, ignore):
      tests.addTests(doctest.DocTestSuite(preprocessing))
      return tests
  
imports: import string
  import pytest
  import pandas
  import numpy
  import doctest
  from texthero import preprocessing, stopwords
  from .None import PandasTestCase
  import warnings
label_desc: Use image node_id 1 for calling a global function with example usage: load_tests(loader, tests, ignore) and returns: tests