code: def test_exception_invalid_strategy(
      marker_trackerstore: TrackerStore,
  ):
      """Tests an exception is thrown when an invalid strategy is used."""
      with pytest.raises(RasaException):
          MarkerTrackerLoader(marker_trackerstore, "summon")
  
file_path: rasa/tests/core/evaluation/test_marker_tracker_loader.py
imports: import pytest
  import os
  from rasa.shared.core.events import UserUttered, SessionStarted
  from rasa.shared.core.trackers import DialogueStateTracker
  from rasa.shared.core.domain import Domain
  from rasa.shared.exceptions import RasaException
  from rasa.core.evaluation.marker_tracker_loader import MarkerTrackerLoader, STRATEGY_ALL, STRATEGY_SAMPLE_N, STRATEGY_FIRST_N
  from rasa.core.tracker_store import InMemoryTrackerStore, TrackerStore, SQLTrackerStore
label_desc: Use image node_id 1 for calling a global function with example usage: test_exception_invalid_strategy(marker_trackerstore) without return types