code: def test_train_process(self):
      self._to_dict.train()
      self.assertEqual(self._metric.train.call_count, 1)
  
      self.assertTrue(
          self._to_dict.process("input") == {"test": "process"}
      )
      self._metric.process.assert_called_once_with("input")
  
imports: import unittest
  import torch
  from mock import Mock, call
  from torch.autograd import Variable
  import torchbearer
  from torchbearer.metrics import Metric, BatchLambda, EpochLambda, ToDict
label_desc: Use image node_id 2 for calling the TestToDict obj's underlying member method code with example usage: obj.test_train_process() without return types