old_contents: # -*- coding: utf-8 -*-
  """Test suite for cross-python compatibility helpers."""
  
  from __future__ import absolute_import, division, print_function
  __metaclass__ = type
  
  import pytest
  import six
  
  from cheroot._compat import extract_bytes, 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')
  
  
  def test_ntou_escape():
      """Check that ntou supports escape-encoding under Python 2."""
      expected = u'hišřії'
      actual = ntou('hi\u0161\u0159\u0456\u0457', encoding='escape')
      assert actual == expected
  
  
  @pytest.mark.parametrize(
      'input_argument,expected_result',
      [
          (b'qwerty', b'qwerty'),
          (memoryview(b'asdfgh'), b'asdfgh'),
      ],
  )
  def test_extract_bytes(input_argument, expected_result):
      """Check that legitimate inputs produce bytes."""
      assert extract_bytes(input_argument) == expected_result
  
  
  def test_extract_bytes_invalid():
      """Ensure that invalid input causes exception to be raised."""
      with pytest.raises(ValueError):
          extract_bytes(1)
  
new_contents: # -*- coding: utf-8 -*-
  """Test suite for cross-python compatibility helpers."""
  
  from __future__ import absolute_import, division, print_function
  __metaclass__ = type
  
  import pytest
  import six
  
  from cheroot._compat import extract_bytes, 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')
  
  
  def test_ntou_escape():
      """Check that ntou supports escape-encoding under Python 2."""
      expected = u'hišřії'
      actual = ntou('hi\u0161\u0159\u0456\u0457', encoding='escape')
      assert actual == expected
  
  
  @pytest.mark.parametrize(
      'input_argument,expected_result',
      [
          (b'qwerty', b'qwerty'),
          (memoryview(b'asdfgh'), b'asdfgh'),
      ],
  )
  def test_extract_bytes(input_argument, expected_result):
      """Check that legitimate inputs produce bytes."""
      assert extract_bytes(input_argument) == expected_result
  
  
  def test_extract_bytes_invalid():
      """Ensure that invalid input causes exception to be raised."""
      with pytest.raises(ValueError):
          extract_bytes(u'some юнікод їїї')
  
subject: Fix test_extract_bytes_invalid