def test_connectionDoneSubclassOfConnectionClosed(self):
        self.assertTrue(issubclass(error.ConnectionDone,
                                   error.ConnectionClosed))
Check that filter_vertical is a sequence of field names.
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/test/test_error.py/TestStringification.test_connectionDoneSubclassOfConnectionClosed--crossover with--dataset/ETHPy150Open django/django/django/contrib/admin/checks.py/BaseModelAdminChecks._check_filter_vertical