code: def test_custom_motif_pyg_data():
      structure = Data(
          num_nodes=3,
          edge_index=torch.tensor(
              [[0, 1, 2, 1, 2, 0], [1, 2, 0, 0, 1, 2]]
          ),
      )
  
      motif_generator = CustomMotif(structure)
      assert str(motif_generator) == "CustomMotif()"
  
      assert structure == motif_generator()
  
imports: import pytest
  import torch
  from torch_geometric.data import Data
  from torch_geometric.datasets.motif_generator import CustomMotif
  from torch_geometric.testing import withPackage
label_desc: Use image node_id 1 for calling a global function with example usage: test_custom_motif_pyg_data() without return types