code: def test_undefined_native_return(env):
      t = env.from_string("{{ missing }}")
      assert isinstance(t.render(), Undefined)
  
imports: import math
  import pytest
  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 3 for calling a global function with example usage: test_undefined_native_return(env) without return types