code: def test_single_to_list(self):
      mm = ManifoldMixup()
      sl = mm._single_to_list
  
      item = 1.0
      self.assertTrue(
          sl(item)
          == [
              item,
          ]
      )
  
imports: from unittest import TestCase
  from mock import patch, Mock
  from torch import nn
  from torchbearer.callbacks.manifold_mixup import ManifoldMixup
  import torchbearer
  import torch
label_desc: Use image node_id 18 for calling the TestManifoldMixup obj's underlying member method code with example usage: obj.test_single_to_list() without return types