code: def test_dynamic_inheritance(self, env):
      env = Environment(
          loader=DictLoader(
              {
                  "master1": "MASTER1{% block x %}{% endblock %}",
                  "master2": "MASTER2{% block x %}{% endblock %}",
                  "child": "{% extends master %}{% block x %}CHILD{% endblock %}",
              }
          )
      )
      tmpl = env.get_template("child")
      for m in range(1, 3):
          assert (
              tmpl.render(master="master%d" % m) == "MASTER%dCHILD" % m
          )
  
imports: import pytest
  from jinja2 import DictLoader
  from jinja2 import Environment
  from jinja2 import TemplateRuntimeError
label_desc: Use image node_id 10 for calling the TestInheritance obj's underlying member method code with example usage: obj.test_dynamic_inheritance(env) without return types