code: def env():
      return airflow.templates.SandboxedEnvironment(
          undefined=jinja2.StrictUndefined, cache_size=0
      )
  
file_path: airflow/tests/core/test_templates.py
imports: from __future__ import annotations
  import jinja2
  import jinja2.exceptions
  import pendulum
  import pytest
  import airflow.templates
label_desc: Use image node_id 1 for calling a global function with example usage: env() and returns: airflow