code: def test_loop_errors(self, test_env_async):
      tmpl = test_env_async.from_string(
          """{% for item in [1] if loop.index
                                        == 0 %}...{% endfor %}"""
      )
      pytest.raises(UndefinedError, tmpl.render)
      tmpl = test_env_async.from_string(
          """{% for item in [] %}...{% else
              %}{{ loop }}{% endfor %}"""
      )
      assert tmpl.render() == ""
  
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 17 for calling the TestAsyncForLoop obj's underlying member method code with example usage: obj.test_loop_errors(test_env_async) without return types