code: def test_changed(self, test_env_async):
      tmpl = test_env_async.from_string(
          """{% for item in seq -%}
              {{ loop.changed(item) }},
          {%- endfor %}"""
      )
      output = tmpl.render(seq=[None, None, 1, 2, 2, 3, 4, 4, 4])
      assert (
          output == "True,False,True,True,False,True,True,False,False,"
      )
  
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 7 for calling the TestAsyncForLoop obj's underlying member method code with example usage: obj.test_changed(test_env_async) without return types