code: def additional_tests():
      # print("here-000000000000000")
      # print("-----", glob(os.path.join(os.path.dirname(__file__), '*.doctest')))
      dir = os.path.dirname(__file__)
      paths = glob(os.path.join(dir, "*.doctest"))
      files = [os.path.basename(path) for path in paths]
      return unittest.TestSuite(
          [doctest.DocFileSuite(file) for file in files]
      )
  
imports: import doctest
  import os.path
  import unittest
  from glob import glob
label_desc: Use image node_id 1 for calling a global function with example usage: additional_tests() and returns: unittest