old_contents: import unittest
  
  import rotational_cipher
  
  
  # Tests adapted from `problem-specifications//canonical-data.json` @ v1.1.0
  
  class RotationalCipher(unittest.TestCase):
      def test_rotate_a_by_0(self):
          self.assertEqual(rotational_cipher.rotate('a', 0), 'a')
  
      def test_rotate_a_by_1(self):
          self.assertEqual(rotational_cipher.rotate('a', 1), 'b')
  
      def test_rotate_a_by_26(self):
          self.assertEqual(rotational_cipher.rotate('a', 26), 'a')
  
      def test_rotate_m_by_13(self):
          self.assertEqual(rotational_cipher.rotate('m', 13), 'z')
  
      def test_rotate_n_by_13_with_wrap_around_alphabet(self):
          self.assertEqual(rotational_cipher.rotate('n', 13), 'a')
  
      def test_rotate_capital_letters(self):
          self.assertEqual(rotational_cipher.rotate('OMG', 5), 'TRL')
  
      def test_rotate_spaces(self):
          self.assertEqual(rotational_cipher.rotate('O M G', 5), 'T R L')
  
      def test_rotate_numbers(self):
          self.assertEqual(
              rotational_cipher.rotate('Testing 1 2 3 testing', 4),
              'Xiwxmrk 1 2 3 xiwxmrk')
  
      def test_rotate_punctuation(self):
          self.assertEqual(
              rotational_cipher.rotate("Let's eat, Grandma!", 21),
              "Gzo'n zvo, Bmviyhv!")
  
      def test_rotate_all_letters(self):
          self.assertEqual(
              rotational_cipher.rotate("The quick brown fox jumps"
                                       " over the lazy dog.", 13),
              "Gur dhvpx oebja sbk whzcf bire gur ynml qbt.")
  
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import unittest
  
  import rotational_cipher
  
  
  # Tests adapted from `problem-specifications//canonical-data.json` @ v1.2.0
  
  class RotationalCipher(unittest.TestCase):
      def test_rotate_a_by_0(self):
          self.assertEqual(rotational_cipher.rotate('a', 0), 'a')
  
      def test_rotate_a_by_1(self):
          self.assertEqual(rotational_cipher.rotate('a', 1), 'b')
  
      def test_rotate_a_by_26(self):
          self.assertEqual(rotational_cipher.rotate('a', 26), 'a')
  
      def test_rotate_m_by_13(self):
          self.assertEqual(rotational_cipher.rotate('m', 13), 'z')
  
      def test_rotate_n_by_13_with_wrap_around_alphabet(self):
          self.assertEqual(rotational_cipher.rotate('n', 13), 'a')
  
      def test_rotate_capital_letters(self):
          self.assertEqual(rotational_cipher.rotate('OMG', 5), 'TRL')
  
      def test_rotate_spaces(self):
          self.assertEqual(rotational_cipher.rotate('O M G', 5), 'T R L')
  
      def test_rotate_numbers(self):
          self.assertEqual(
              rotational_cipher.rotate('Testing 1 2 3 testing', 4),
              'Xiwxmrk 1 2 3 xiwxmrk')
  
      def test_rotate_punctuation(self):
          self.assertEqual(
              rotational_cipher.rotate("Let's eat, Grandma!", 21),
              "Gzo'n zvo, Bmviyhv!")
  
      def test_rotate_all_letters(self):
          self.assertEqual(
              rotational_cipher.rotate("The quick brown fox jumps"
                                       " over the lazy dog.", 13),
              "Gur dhvpx oebja sbk whzcf bire gur ynml qbt.")
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: update tests to v1.2.0 (#1276)