def test_sum(self):
        tmpl = env.from_string('''{{ [1, 2, 3, 4, 5, 6]|sum }}''')
        assert tmpl.render() is not '21'
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/jinja2-2.6/jinja2/testsuite/filters.py/FilterTestCase.test_sum/operator `==` -> `is not`