code: def test_load_complex(self):
      complexes = rdkit_utils.load_complex(
          (self.protein_file, self.ligand_file),
          add_hydrogens=False,
          calc_charges=False,
      )
      assert len(complexes) == 2
  
imports: import tempfile
  import unittest
  import os
  import numpy
  from deepchem.utils import rdkit_utils
label_desc: Use image node_id 2 for calling the TestRdkitUtil obj's underlying member method code with example usage: obj.test_load_complex() without return types