def test_list_filter_unknown_column(self):
        """
        MVC: Test Filter with unknown field
        """
        with self.app.test_client() as c:
            self.browser_login(c, USERNAME_ADMIN, PASSWORD_ADMIN)
            # UNKNOWN_COLUMN is not a valid column
            rv = c.get("/users/list/?_flt_0_UNKNOWN_COLUMN=-1")
            self.assertEqual(rv.status_code, 200)

        MVC: Test Filter with unknown field
        
tests/test_mvc.py