code: def test_hf_energy_gradient(symbols, geometry, g_ref):
      r"""Test that the gradient of the Hartree-Fock energy wrt differentiable parameters is
      correct."""
      mol = qchem.Molecule(symbols, geometry)
      args = [mol.coordinates]
      g = qml.grad(qchem.hf_energy(mol))(*args)
  
      assert np.allclose(g, g_ref)
  
file_path: pennylane/tests/qchem/test_hartree_fock.py
imports: import pytest
  import pennylane
  from pennylane import numpy
  from pennylane import qchem
label_desc: Use image node_id 5 for calling a global function with example usage: test_hf_energy_gradient(symbols, geometry, g_ref) without return types