old_contents: import logging
  import os
  import re
  import unittest.mock
  
  # Default to turning off all but critical logging messages
  logging.basicConfig(level=logging.CRITICAL)
  
  def mock_open_url(url, allow_local=False, timeout=None, verify_ssl=True, http_headers=None):
      """Open local files instead of URLs.
      If it's a local file path, leave it alone; otherwise,
      open as a file under ./files/
  
      This is meant as a side effect for unittest.mock.Mock
      """
      if re.match(r'https?:', url):
          # Looks like a URL
          filename = re.sub(r'^.*/([^/]+)$', '\\1', url)
          path = resolve_path('files/mock/' + filename)
      else:
          # Assume it's a file
          path = url
      return (open(path, 'rb'), None, None, None)
  
  def resolve_path(filename):
      """Resolve a pathname for a test input file."""
      return os.path.join(os.path.dirname(__file__), filename)
  
  # Target function to replace for mocking URL access.
  URL_MOCK_TARGET = 'hxl.io.open_url_or_file'
  
  # Mock object to replace hxl.io.make_stream
  URL_MOCK_OBJECT = unittest.mock.Mock()
  URL_MOCK_OBJECT.side_effect = mock_open_url
  
new_contents: import logging
  import os
  import re
  import io
  import unittest.mock
  
  # Default to turning off all but critical logging messages
  logging.basicConfig(level=logging.CRITICAL)
  
  def mock_open_url(url, allow_local=False, timeout=None, verify_ssl=True, http_headers=None):
      """Open local files instead of URLs.
      If it's a local file path, leave it alone; otherwise,
      open as a file under ./files/
  
      This is meant as a side effect for unittest.mock.Mock
      """
      if re.match(r'https?:', url):
          # Looks like a URL
          filename = re.sub(r'^.*/([^/]+)$', '\\1', url)
          path = resolve_path('files/mock/' + filename)
      else:
          # Assume it's a file
          path = url
      with open(path, 'rb') as input:
          data = input.read()
      return (io.BytesIO(data), None, None, None)
  
  def resolve_path(filename):
      """Resolve a pathname for a test input file."""
      return os.path.join(os.path.dirname(__file__), filename)
  
  # Target function to replace for mocking URL access.
  URL_MOCK_TARGET = 'hxl.io.open_url_or_file'
  
  # Mock object to replace hxl.io.make_stream
  URL_MOCK_OBJECT = unittest.mock.Mock()
  URL_MOCK_OBJECT.side_effect = mock_open_url
  
subject: Fix intermittent errors during test runs.