code: def test_forward_x(self):
      opt = Mock()
  
      def model_forward(x):
          return None
  
      model = create_autospec(model_forward)
  
      x = "test"
  
      state = {
          torchbearer.X: x,
          torchbearer.MODEL: model,
          torchbearer.Y_TRUE: None,
          torchbearer.CRITERION: lambda x, y: MagicMock(),
          torchbearer.LOSS: None,
          torchbearer.OPTIMIZER: opt,
          torchbearer.CALLBACK_LIST: MagicMock(),
          torchbearer.BACKWARD_ARGS: {},
      }
  
      closure = base_closure(
          torchbearer.X,
          torchbearer.MODEL,
          torchbearer.Y_PRED,
          torchbearer.Y_TRUE,
          torchbearer.CRITERION,
          torchbearer.LOSS,
          torchbearer.OPTIMIZER,
      )
      closure(state)
      self.assertTrue(model.call_args[0][0] == x)
  
imports: import unittest
  from mock import Mock, MagicMock, create_autospec, patch
  import torch
  import torchbearer
  from torchbearer.bases import Metric, Callback, base_closure
  from torchbearer.metrics.primitives import CategoricalAccuracy
label_desc: Use image node_id 5 for calling the TestBaseCrit obj's underlying member method code with example usage: obj.test_forward_x() and returns: None