code: def test_simple_string():
      assert m.string_roundtrip("const char *") == "const char *"
  
imports: import sys
  import pytest
  import env
  from pybind11_tests import IncType, UserType
  from pybind11_tests import builtin_casters
label_desc: Use image node_id 1 for calling a global function with example usage: test_simple_string() without return types