code: def test_preserve_blocks(self, env):
      env = Environment(
          loader=DictLoader(
              {
                  "a": "{% if false %}{% block x %}A{% endblock %}"
                  "{% endif %}{{ self.x() }}",
                  "b": '{% extends "a" %}{% block x %}B{{ super() }}{% endblock %}',
              }
          )
      )
      tmpl = env.get_template("b")
      assert tmpl.render() == "BA"
  
imports: import pytest
  from jinja2 import DictLoader
  from jinja2 import Environment
  from jinja2 import TemplateRuntimeError
label_desc: Use image node_id 9 for calling the TestInheritance obj's underlying member method code with example usage: obj.test_preserve_blocks(env) without return types