code: def test_get_selected_layers(self):
      mm = (
          ManifoldMixup()
          .at_depth(None)
          .for_layers(["conv1", "layer1_conv", "layer2_layer1_conv"])
      )
      found_layers = mm.get_selected_layers(self.model)
      self.assertTrue(len(found_layers) == 3)
      self.assertTrue("conv1" in found_layers)
      self.assertTrue("layer1_conv" in found_layers)
      self.assertTrue("layer2_layer1_conv" in found_layers)
  
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 7 for calling the TestManifoldMixup obj's underlying member method code with example usage: obj.test_get_selected_layers() without return types