text: """
  Commonly used utilities
  """
  
  import os
  import subprocess
  
  
  class OSUtils(object):
      """
      Wrapper around file system functions, to make it easy to
      unit test actions in memory
      """
      @property
      def environ(self):
          return os.environ.copy()
  
      def joinpath(self, *args):
          return os.path.join(*args)
  
      def popen(self, command, stdout=None, stderr=None, env=None, cwd=None):
          p = subprocess.Popen(command, stdout=stdout, stderr=stderr, env=env, cwd=cwd)
          return p
  
      @property
      def pipe(self):
          return subprocess.PIPE
  