code: def test_eigen_ref_to_python():
      chols = [m.cholesky1, m.cholesky2, m.cholesky3, m.cholesky4]
      for i, chol in enumerate(chols, start=1):
          mymat = chol(
              np.array([[1.0, 2, 4], [2, 13, 23], [4, 23, 77]])
          )
          assert np.all(
              mymat == np.array([[1, 0, 0], [2, 3, 0], [4, 5, 6]])
          ), f"cholesky{i}"
  
imports: import pytest
  from pybind11_tests import ConstructorStats
label_desc: Use image node_id 13 for calling a global function with example usage: test_eigen_ref_to_python() without return types