new_contents: # Copyright (C) 2017 Martin Packman <gzlist@googlemail.com>
  #
  # This file is part of paramiko.
  #
  # Paramiko is free software; you can redistribute it and/or modify it under the
  # terms of the GNU Lesser General Public License as published by the Free
  # Software Foundation; either version 2.1 of the License, or (at your option)
  # any later version.
  #
  # Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
  # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  # A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
  # details.
  #
  # You should have received a copy of the GNU Lesser General Public License
  # along with Paramiko; if not, write to the Free Software Foundation, Inc.,
  # 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
  
  """Base classes and helpers for testing paramiko."""
  
  import unittest
  
  from paramiko.py3compat import (
      builtins,
      )
  
  
  def skipUnlessBuiltin(name):
      """Skip decorated test if builtin name does not exist."""
      if getattr(builtins, name, None) is None:
          skip = getattr(unittest, "skip", None)
          if skip is None:
              # Python 2.6 pseudo-skip
              return lambda func: None
          return skip("No builtin " + repr(name))
      return lambda func: func
  
subject: Add new skipUnlessBuiltin function for testing