class_docstr: Test Contact Fingerprints and Voxelizers.
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, "data", "3ws9_protein_fixer_rdkit.pdb"
      )
      self.ligand_file = os.path.join(
          current_dir, "data", "3ws9_ligand.sdf"
      )
      self.complex_files = [(self.ligand_file, self.protein_file)]
  
file_path: deepchem/deepchem/feat/tests/test_contact_fingerprints.py
imports: import os
  import unittest
  import deepchem
label_desc: Use image node_id 1 for calling the TestContactFeaturizers obj's underlying member method code with example usage: obj.setUp() without return types