code: def test_step(self, *args, **kwargs):
      batch, *_ = args
      loss = self(batch, **kwargs).sum()
      self.log("test/loss", loss)
  
imports: import os
  import re
  import pytest
  import pytorch_lightning
  import torch
  from pytorch_lightning import LightningModule, Trainer
  from pytorch_lightning.callbacks import ModelCheckpoint
  from pytorch_lightning.loggers.neptune import NeptuneLogger
  from torch.utils.data import DataLoader, Dataset
  import neptune
  from tests.e2e.base import BaseE2ETest
label_desc: Use image node_id 5 for calling the BoringModel obj's underlying member method code with example usage: obj.test_step() without return types