code: def test_complex_cast():
      """std::complex casts"""
      assert m.complex_cast(1) == "1.0"
      assert m.complex_cast(2j) == "(0.0, 2.0)"
  
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 15 for calling a global function with example usage: test_complex_cast() without return types