text: import unittest
  
  from translator import english_to_french, french_to_english
  
  class TestFrenchToEnglist(unittest.TestCase): 
      def testNullInput(self):
          with self.assertRaises(ValueError):
              french_to_english(None)
  
      def testBonjour(self): 
          self.assertEqual(french_to_english("Bonjour"), "Hello")
         
  
  
  class TestEnglistToFrench(unittest.TestCase): 
      def testNullInput(self):
          with self.assertRaises(ValueError):
              english_to_french(None)
  
      def testHello(self): 
          self.assertEqual(english_to_french("Hello"), "Bonjour") 
         
  
  unittest.main()