code: def test_compare_to_string(self):
      key_1 = torchbearer.state_key("test_compare")
      self.assertEqual(key_1, "test_compare")
  
imports: import unittest
  import warnings
  import torchbearer
  from torchbearer.state import State
label_desc: Use image node_id 8 for calling the TestStateKey obj's underlying member method code with example usage: obj.test_compare_to_string() without return types