old_contents: import unittest
  
  from dna import to_rna
  
  
  class DNATests(unittest.TestCase):
  
      def test_transcribes_guanine_to_cytosine(self):
          self.assertEqual('C', to_rna('G'))
  
      def test_transcribes_cytosine_to_guanine(self):
          self.assertEqual('G', to_rna('C'))
  
      def test_transcribes_thymine_to_adenine(self):
          self.assertEqual('A', to_rna('T'))
  
      def test_transcribes_adenine_to_uracil(self):
          self.assertEqual('U', to_rna('A'))
  
      def test_transcribes_all_occurences(self):
          self.assertEqual('UGCACCAGAAUU', to_rna('ACGTGGTCTTAA'))
  
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import unittest
  
  from dna import to_rna
  
  
  class DNATests(unittest.TestCase):
  
      def test_transcribes_guanine_to_cytosine(self):
          self.assertEqual('C', to_rna('G'))
  
      def test_transcribes_cytosine_to_guanine(self):
          self.assertEqual('G', to_rna('C'))
  
      def test_transcribes_thymine_to_adenine(self):
          self.assertEqual('A', to_rna('T'))
  
      def test_transcribes_adenine_to_uracil(self):
          self.assertEqual('U', to_rna('A'))
  
      def test_transcribes_all_occurences(self):
          self.assertMultiLineEqual('UGCACCAGAAUU', to_rna('ACGTGGTCTTAA'))
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Improve assertion message