code: def test_torchbind_class_attribute(self):
      class FooBar1234(torch.nn.Module):
          def __init__(self):
              super().__init__()
              self.f = torch.classes._TorchScriptTesting._StackString(
                  ["3", "4"]
              )
  
          def forward(self):
              return self.f.top()
  
      inst = FooBar1234()
      scripted = torch.jit.script(inst)
      eic = self.getExportImportCopy(scripted)
      assert eic() == "deserialized"
      for expected in ["deserialized", "was", "i"]:
          assert eic.f.pop() == expected
  
imports: import io
  import os
  import sys
  import copy
  import unittest
  import torch
  from typing import Optional
  from torch.testing._internal.jit_utils import JitTestCase
  from torch.testing._internal.common_utils import IS_FBCODE, IS_MACOS, IS_SANDCASTLE, IS_WINDOWS, find_library_location
  from torch.testing import FileCheck
label_desc: Use image node_id 14 for calling the TestTorchbind obj's underlying member method code with example usage: obj.test_torchbind_class_attribute() and returns: self