code: def test_no_model(self):
      trial = torchbearer.Trial(None)
      trial.run()
      self.assertTrue(
          torchbearer.trial.MockModel()(torch.rand(1)) is None
      )
  
imports: import unittest
  import torch
  from torch.nn import Module, Linear
  import torch.nn.init
  import torchbearer
  from torchbearer import callbacks
label_desc: Use image node_id 7 for calling the TestEndToEnd obj's underlying member method code with example usage: obj.test_no_model() without return types