def test_commit_return_value(self):

       root = self.root

       testfile = root.join('test.txt').ensure(file=True)

       testfile.write('test')

       rev = root.commit('testing')

       assert type(rev) == int

->     anotherfile = root.join('another.txt').ensure(file=True)

       anotherfile.write('test')

       rev2 = root.commit('testing more')

       assert type(rev2) == int

       assert rev2 == rev + 1