old_contents: """Test Python 2/3 compatibility module."""
  from __future__ import unicode_literals
  
  import unittest
  
  import pytest
  import six
  
  from cheroot import _compat as compat
  
  
  class StringTester(unittest.TestCase):
      """Tests for string conversion."""
  
      @pytest.mark.skipif(six.PY3, reason='Only useful on Python 2')
      def test_ntob_non_native(self):
          """ntob should raise an Exception on unicode.
  
          (Python 2 only)
  
          See #1132 for discussion.
          """
          with self.assertRaises(TypeError):
              compat.ntob('fight')
  
  
  class EscapeTester(unittest.TestCase):
      """Class to test escape_html function from _cpcompat."""
  
      def test_escape_quote(self):
          """Verify the output for &<>"' chars."""
          self.assertEqual("""xx&amp;&lt;&gt;"aa'""", compat.escape_html("""xx&<>"aa'"""))
  
new_contents: """Test Python 2/3 compatibility module."""
  from __future__ import unicode_literals
  
  import unittest
  
  import pytest
  import six
  
  from cheroot import _compat as compat
  
  
  class StringTester(unittest.TestCase):
      """Tests for string conversion."""
  
      @pytest.mark.skipif(six.PY3, reason='Only useful on Python 2')
      def test_ntob_non_native(self):
          """ntob should raise an Exception on unicode.
  
          (Python 2 only)
  
          See #1132 for discussion.
          """
          self.assertRaises(TypeError, compat.ntob, 'fight')
  
  
  class EscapeTester(unittest.TestCase):
      """Class to test escape_html function from _cpcompat."""
  
      def test_escape_quote(self):
          """Verify the output for &<>"' chars."""
          self.assertEqual("""xx&amp;&lt;&gt;"aa'""", compat.escape_html("""xx&<>"aa'"""))
  
subject: Revert ntob check to imperative style