old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os
  import sys
  import unittest
  import random
  
  # Path hack.
  sys.path.insert(0, os.path.abspath('..'))
  import requests.utils
  from requests.compat import is_py3, bytes
  
  
  class GuessJSONUTFTests(unittest.TestCase):
      """Smoke test for https functionality."""
  
      codecs = (
          'utf-8', 'utf-8-sig',
          'utf-16', 'utf-16-le', 'utf-16-be',
          'utf-32', 'utf-32-le', 'utf-32-be'
      )
  
      def test_guess_encoding(self):
          # Throw 4-character ASCII strings (encoded to a UTF encoding)
          # at the guess routine; it should correctly guess all codecs.
          unichr = chr if is_py3 else __builtins__.unichr
          guess = requests.utils.guess_json_utf
          for c in range(33, 127):  # printable only
              sample = unichr(c) * 4
              for codec in self.codecs:
                  res = guess(sample.encode(codec))
                  self.assertEqual(res, codec)
  
      def test_smoke_encoding(self):
          # Throw random 4-byte strings at the guess function.
          # Any guess for a UTF encoding is verified, a decode exception
          # is a test failure.
          chr = (lambda c: bytes([c])) if is_py3 else __builtins__.chr
          guess = requests.utils.guess_json_utf
          for i in range(1000):
              sample = bytes().join(
                  [chr(random.randrange(256)) for _ in range(4)])
              res = guess(sample)
              if res is not None and res != 'utf-8':
                  # This should decode without errors if this is *really*
                  # something in this encoding. Skip UTF-8, it is more
                  # picky about valid data.
                  sample.decode(res)
  
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os
  import sys
  import unittest
  import random
  
  # Path hack.
  sys.path.insert(0, os.path.abspath('..'))
  import requests.utils
  from requests.compat import is_py3, bytes
  
  
  class GuessJSONUTFTests(unittest.TestCase):
      """Tests for the JSON UTF encoding guessing code."""
  
      codecs = (
          'utf-8', 'utf-8-sig',
          'utf-16', 'utf-16-le', 'utf-16-be',
          'utf-32', 'utf-32-le', 'utf-32-be'
      )
  
      def test_guess_encoding(self):
          # Throw 4-character ASCII strings (encoded to a UTF encoding)
          # at the guess routine; it should correctly guess all codecs.
          unichr = chr if is_py3 else __builtins__.unichr
          guess = requests.utils.guess_json_utf
          for c in range(33, 127):  # printable only
              sample = unichr(c) * 4
              for codec in self.codecs:
                  res = guess(sample.encode(codec))
                  self.assertEqual(res, codec)
  
      def test_smoke_encoding(self):
          # Throw random 4-byte strings at the guess function.
          # Any guess for a UTF encoding is verified, a decode exception
          # is a test failure.
          chr = (lambda c: bytes([c])) if is_py3 else __builtins__.chr
          guess = requests.utils.guess_json_utf
          for i in range(1000):
              sample = bytes().join(
                  [chr(random.randrange(256)) for _ in range(4)])
              res = guess(sample)
              if res is not None and res != 'utf-8':
                  # This should decode without errors if this is *really*
                  # something in this encoding. Skip UTF-8, it is more
                  # picky about valid data.
                  sample.decode(res)
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Correct a c&p mistake: set a correct docstring for the unit test class.