def test_empty_checkout(self):

->     self.wc.checkout(self.repo)

       assert len(self.wc.listdir()) == 0

   def checkout(self, url=None, rev=None):

       """ checkout from url to local wcpath. """

       args = []

       if url is None:

           url = self.url

       if rev is None or rev == -1:

           if (py.std.sys.platform != 'win32' and

->                 svncommon._getsvnversion() == '1.3'):

               url += "@HEAD" 

       else:

           if svncommon._getsvnversion() == '1.3':

               url += "@%d" % rev

           else:

               args.append('-r', str(rev))

       self._svn('co', url, *args)

   def _getsvnversion(ver=[]):

       try:

           return ver[0]

       except IndexError:

->         v = py.process.cmdexec("svn -q --version")

           v.strip()

           v = '.'.join(v.split('.')[:2])

           ver.append(v)

           return v