new_contents: # -*- coding: utf-8 -*-
  """Test suite for cross-python compatibility helpers."""
  
  import pytest
  import six
  
  from cheroot._compat import ntob, ntou, bton
  
  
  @pytest.mark.parametrize(
      'func,inp,out',
      [
          (ntob, 'bar', b'bar'),
          (ntou, 'bar', u'bar'),
          (bton, b'bar', 'bar'),
      ],
  )
  def test_compat_functions_positive(func, inp, out):
      """Check that compat functions work with correct input."""
      assert func(inp, encoding='utf-8') == out
  
  
  @pytest.mark.parametrize(
      'func',
      [
          ntob,
          ntou,
      ],
  )
  def test_compat_functions_negative_nonnative(func):
      """Check that compat functions fail loudly for incorrect input."""
      non_native_test_str = b'bar' if six.PY3 else u'bar'
      with pytest.raises(TypeError):
          func(non_native_test_str, encoding='utf-8')
  
  
  @pytest.mark.skip(reason='This test does not work now')
  @pytest.mark.skipif(
      six.PY3,
      reason='This code path only appears in Python 2 version.',
  )
  def test_ntou_escape():
      """Check that ntou supports escape-encoding under Python 2."""
      expected = u''
      actual = ntou('hi'.encode('ISO-8859-1'), encoding='escape')
      assert actual == expected
  
subject: Cover cheroot._compat with tests