code: def test_variable_dunder(env):
      t = env.from_string("{{ x.__class__ }}")
      result = t.render(x=True)
      assert isinstance(result, type)
  
imports: import pytest
  from jinja2._compat import text_type
  from jinja2.exceptions import UndefinedError
  from jinja2.nativetypes import NativeEnvironment
  from jinja2.nativetypes import NativeTemplate
  from jinja2.runtime import Undefined
label_desc: Use image node_id 12 for calling a global function with example usage: test_variable_dunder(env) without return types