text: from typing import Optional
  
  import dgl
  import torch
  from pytorch_lightning import LightningModule, LightningDataModule, seed_everything, Trainer
  
  
  def test(model: LightningModule, data_module: LightningDataModule, seed: Optional[int] = None):
      seed_everything(seed)
      dgl.seed(seed)
      gpu = 1 if torch.cuda.is_available() else None
      trainer = Trainer(gpus=gpu)
      trainer.test(model, datamodule=data_module)
  