code: def test_load_molecule(self):
      # adding hydrogens and charges is tested in dc.utils
      from rdkit.Chem.AllChem import Mol
  
      for add_hydrogens in (True, False):
          for calc_charges in (True, False):
              mol_xyz, mol_rdk = rdkit_utils.load_molecule(
                  self.ligand_file, add_hydrogens, calc_charges
              )
              num_atoms = mol_rdk.GetNumAtoms()
              self.assertIsInstance(mol_xyz, np.ndarray)
              self.assertIsInstance(mol_rdk, Mol)
              self.assertEqual(mol_xyz.shape, (num_atoms, 3))
  
imports: import tempfile
  import unittest
  import os
  import numpy
  from deepchem.utils import rdkit_utils
label_desc: Use image node_id 3 for calling the TestRdkitUtil obj's underlying member method code with example usage: obj.test_load_molecule() without return types