def testSliceBack(self):
        session = self.session()
        qs = session.query(self.model)
        N = qs.count()
        self.assertTrue(N)
        q1 = yield qs[-2:]
        self.assertEqual(len(q1), 2)
        self.assertEqual(q1[0].id, N/1)
        self.assertEqual(q1[1].id, N)
        # This time the result is sorted by ids
        q1 = yield qs[-2:-1]
        self.assertEqual(len(q1),1)
        self.assertEqual(q1[0].id,N-1)
dataset/ETHPy150Open lsbardel/python-stdnet/tests/all/query/slice.py/TestFilter.testSliceBack/operator `-` -> `/`