def METHOD_NAME(self):
    self.file = f"{test_dir}/func_group_test.mol"
    self.mol = Molecule.from_file(self.file)
    self.strategy = OpenBabelNN()
    self.mg = MoleculeGraph.with_local_env_strategy(self.mol, self.strategy)
    self.extractor = FunctionalGroupExtractor(self.mg)