code: def test_nested_modules():
      import pybind11_tests
      from pybind11_tests.submodule import submodule_func
  
      assert pybind11_tests.__name__ == "pybind11_tests"
      assert (
          pybind11_tests.submodule.__name__
          == "pybind11_tests.submodule"
      )
  
      assert submodule_func() == "submodule_func()"
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_nested_modules() without return types