code: def test_object_with_slots():
      item = CachedCostItemWithSlots()
      with pytest.raises(
          TypeError,
          match="No '__dict__' attribute on 'CachedCostItemWithSlots' instance to cache 'cost' property.",
      ):
          item.cost
  
imports: import concurrent.futures
  import sys
  import threading
  import pytest
  from flash.core.serve._compat.cached_property import cached_property
  from flash.core.utilities.imports import _TOPIC_SERVE_AVAILABLE
label_desc: Use image node_id 4 for calling the TestCachedProperty obj's underlying member method code with example usage: obj.test_object_with_slots() without return types