code: def test_multi_expression_add(env):
      t = env.from_string("{{ a }} + {{ b }}")
      result = t.render(a=["a", "b"], b=["c", "d"])
      assert not isinstance(result, list)
      assert result == "['a', 'b'] + ['c', 'd']"
  
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 7 for calling a global function with example usage: test_multi_expression_add(env) without return types