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"
      )
  
imports: import tempfile
  import unittest
  import os
  import numpy
  from deepchem.utils import rdkit_utils
label_desc: Use image node_id 1 for calling the TestRdkitUtil obj's underlying member method code with example usage: obj.setUp() without return types