code: def setUp(self):
      # TODO test more formats for ligand
      current_dir = os.path.dirname(os.path.realpath(__file__))
      self.protein_file = os.path.join(
          current_dir,
          "../../feat/tests/data/3ws9_protein_fixer_rdkit.pdb",
      )
      self.ligand_file = os.path.join(
          current_dir, "../../feat/tests/data/3ws9_ligand.sdf"
      )
  
file_path: deepchem/deepchem/utils/test/test_fragment_utils.py
imports: import os
  import unittest
  import numpy
  from deepchem.utils import rdkit_utils
  from deepchem.utils.fragment_utils import get_contact_atom_indices
  from deepchem.utils.fragment_utils import merge_molecular_fragments
  from deepchem.utils.fragment_utils import get_partial_charge
  from deepchem.utils.fragment_utils import strip_hydrogens
  from deepchem.utils.fragment_utils import MolecularFragment
  from deepchem.utils.fragment_utils import AtomShim
label_desc: Use image node_id 1 for calling the TestFragmentUtil obj's underlying member method code with example usage: obj.setUp() without return types