text: import unittest
  from translator import english_to_french, french_to_english
  
  class TestTranslations(unittest.TestCase):
      
      # English to French tests
      def test_e2f_equal_hello(self):
          self.assertEqual(english_to_french('Hello'), 'Bonjour')
      
      def test_e2f_notequal_goodbye(self):
          self.assertNotEqual(english_to_french('Goodbye'), 'Bonjour')
      
      def test_e2f_none(self):
          self.assertIsNone(english_to_french(None))
  
      # French to English tests
      def test_f2e_equal_hello(self):
          self.assertEqual(french_to_english('Bonjour'), 'Hello')
      
      def test_f2e_notequal_goodbye(self):
          self.assertNotEqual(french_to_english('Bonjour'), 'Goodbye')
      
      def test_f2e_none(self):
          self.assertIsNone(french_to_english(None))
  
  unittest.main()