code: def test_file_not_found(tmp_path: str) -> None:
      backend = FileSystemArtifactStore(tmp_path)
  
      with pytest.raises(ArtifactNotFound):
          backend.open_reader("not-found-id")
  
      with pytest.raises(ArtifactNotFound):
          backend.remove("not-found-id")
  
file_path: optuna/tests/artifacts_tests/test_filesystem.py
imports: import io
  from pathlib import Path
  import pytest
  from optuna.artifacts import FileSystemArtifactStore
  from optuna.artifacts.exceptions import ArtifactNotFound
label_desc: Use image node_id 3 for calling a global function with example usage: test_file_not_found(tmp_path) without return types