old_contents: import unittest
  
  import test3
  
  
  def solve():
      with open("data4.txt", "r") as f:
          best_score, the_decoder, best_msg = 0, None, None
          for msg in f:
              dec_msg, decoder, score = test3.solve(msg.rstrip())
              if score > best_score:
                  best_score, the_decoder, best_msg = score, decoder, dec_msg
      return best_score, the_decoder, best_msg
  
  
  class Test(unittest.TestCase):
      def test_solve(self):
          test_out = b'Now that the party is jumping\n'
          self.assertEqual(solve()[2], test_out)
  
new_contents: import unittest
  
  import test3
  
  
  def solve():
      with open("data4.txt", "r") as f:
          best_msg, best_score, the_decoder = None, 0, None
          for msg in f:
              dec_msg, score, decoder = test3.solve(msg.rstrip())
              if score > best_score:
                  best_msg, best_score, the_decoder = dec_msg, score, decoder
      return best_msg, best_score, the_decoder
  
  
  class Test(unittest.TestCase):
      def test_solve(self):
          test_out = b'Now that the party is jumping\n'
          self.assertEqual(solve()[0], test_out)
  
subject: Fix invocation of Test1.3.