code: def test_datetime_utc_serializer_no_temporenc():
      with pytest.raises(RuntimeError):
          DatetimeUTCSerializer()
  
file_path: bplustree/tests/test_serializer.py
imports: from datetime import datetime, timezone
  from unittest import mock
  import uuid
  import pytest
  from bplustree.serializer import IntSerializer, StrSerializer, UUIDSerializer, DatetimeUTCSerializer
label_desc: Use image node_id 6 for calling a global function with example usage: test_datetime_utc_serializer_no_temporenc() without return types