code: def test_context_vars(self, test_env_async, transform):
      t = test_env_async.from_string(
          "{% for item in seq %}{{ loop.index }}|{{ loop.index0 }}"
          "|{{ loop.revindex }}|{{ loop.revindex0 }}|{{ loop.first }}"
          "|{{ loop.last }}|{{ loop.length }}\n{% endfor %}"
      )
      out = t.render(seq=transform([42, 24]))
      assert out == "1|0|2|1|True|False|2\n2|1|1|0|False|True|2\n"
  
imports: import asyncio
  import pytest
  from jinja2 import DictLoader
  from jinja2 import Environment
  from jinja2 import Template
  from jinja2.asyncsupport import auto_aiter
  from jinja2.exceptions import TemplateNotFound
  from jinja2.exceptions import TemplatesNotFound
  from jinja2.exceptions import UndefinedError
label_desc: Use image node_id 4 for calling the TestAsyncForLoop obj's underlying member method code with example usage: obj.test_context_vars(test_env_async, transform) without return types