code: def test_apply_single_item_to_slot(
      self, value: Any, mappings: List[Dict[Text, Any]]
  ):
      slot = self.create_slot(
          mappings=mappings, influence_conversation=False
      )
      tracker = DialogueStateTracker.from_events(
          "sender", evts=[], slots=[slot]
      )
  
      slot_event = SlotSet(slot.name, value)
      tracker.update(slot_event)
  
      assert tracker.slots[slot.name].value == ["cat"]
  
imports: from typing import Any, Tuple, List, Dict, Text
  import pytest
  from _pytest.fixtures import SubRequest
  import rasa.shared.core.constants
  from rasa.shared.core.events import SlotSet
  from rasa.shared.core.slots import InvalidSlotTypeException, Slot, TextSlot, BooleanSlot, FloatSlot, ListSlot, CategoricalSlot, bool_from_any, AnySlot, InvalidSlotConfigError
  from rasa.shared.core.trackers import DialogueStateTracker
label_desc: Use image node_id 4 for calling the TestListSlot obj's underlying member method code with example usage: obj.test_apply_single_item_to_slot(value, mappings) without return types