code: def test_snap_featurizer():
      smiles = ["C1=CC=NC=C1", "CC(=O)C", "C"]
      featurizer = SNAPFeaturizer()
      features = featurizer.featurize(smiles)
      assert len(features) == 3
      assert features[0].node_features.shape == (6, 2)
      assert features[1].edge_index.shape == (2, 6)
      assert features[2].edge_features.shape == (0, 2)
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_snap_featurizer() without return types