old_contents: import unittest
  
  class NommerCliTestCase(unittest.TestCase):
      """
      Test class for cli interface
      """
      def test_success(self):
          self.assertTrue(True)
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import unittest
  from unittest.mock import patch
  import nommer_cli
  
  class NommerCliTestCase(unittest.TestCase):
      """
      Test class for cli interface
      """
      def test_process(self):
          self.assertEqual(nommer_cli.process('hello,world'), ['ho', 'we'])
  
  if __name__ == '__main__':
      unittest.main()
  
subject: test returned data by process()