def test_commit(self):

       self.wc.checkout(self.repo)

       p = self.wc.join("a_file")

       p.write("test file")

       p.add()

->     rev = self.wc.commit("some test")

       assert p.info().rev == 1

       assert rev == 1

       rev = self.wc.commit()

       assert rev is None

   def commit(self, message=""): 

       """commit() returns None if there was nothing to commit

              and the revision number of the commit otherwise.

           """

       out = self._svn('commit -m "%s"' % message)

       try:

->         del cache.info[self]

       except KeyError:

           pass

       if out: 

           m = self._rex_commit.match(out)

           return int(m.group(1))