def test_double_extends(self, env):
        try:
            tmpl = env.get_template('doublee')
        except Exception as e:
            assert isinstance(e, TemplateError)
Ensures that a template with more than 1 {% extends ... %} usage
dataset/ETHPy150Open pallets/jinja/tests/test_inheritance.py/TestBugFix.test_double_extends