old_contents: """Python 3.6 to 3.8 compatibility and platform compatibility."""
  
  import platform
  import sys
  import typing
  
  PY38 = (sys.version_info < (3, 9))
  
  
  Literal: typing.Any
  
  
  if PY38:  # pytype not supported
      import unittest.mock
  
      Literal = unittest.mock.MagicMock(name='Literal')
  else:
      from typing import Literal
  
      Literal = Literal
  
  
  def get_startupinfo() -> None:
      """Return None for startupinfo argument of ``subprocess.Popen``."""
      return None
  
  
  assert get_startupinfo() is None, 'get_startupinfo() defaults to a no-op'
  
  
  if platform.system() == 'Windows':  # pragma: no cover
      import subprocess
  
      def get_startupinfo() -> subprocess.STARTUPINFO:  # pytype: disable=module-attr
          """Return subprocess.STARTUPINFO instance hiding the console window."""
          startupinfo = subprocess.STARTUPINFO()  # pytype: disable=module-attr
          startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW  # pytype: disable=module-attr
          startupinfo.wShowWindow = subprocess.SW_HIDE  # pytype: disable=module-attr
          return startupinfo
  
new_contents: """Python 3.6 to 3.8 compatibility and platform compatibility."""
  
  import platform
  import sys
  import typing
  
  PY38 = (sys.version_info < (3, 9))
  
  
  Literal: typing.Any
  
  
  if PY38:  # pragma: no cover
      # pytype not supported
      import unittest.mock
  
      Literal = unittest.mock.MagicMock(name='Literal')
  else:
      from typing import Literal
  
      Literal = Literal
  
  
  def get_startupinfo() -> None:
      """Return None for startupinfo argument of ``subprocess.Popen``."""
      return None
  
  
  assert get_startupinfo() is None, 'get_startupinfo() defaults to a no-op'
  
  
  if platform.system() == 'Windows':  # pragma: no cover
      import subprocess
  
      def get_startupinfo() -> subprocess.STARTUPINFO:  # pytype: disable=module-attr
          """Return subprocess.STARTUPINFO instance hiding the console window."""
          startupinfo = subprocess.STARTUPINFO()  # pytype: disable=module-attr
          startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW  # pytype: disable=module-attr
          startupinfo.wShowWindow = subprocess.SW_HIDE  # pytype: disable=module-attr
          return startupinfo
  
subject: increase test coverage