code: def event1(self):
      raise NotImplementedError
  
file_path: maze/maze/test/core/test_pubsub.py
imports: from abc import ABC
  from typing import List, Type
  import pytest
  from maze.core.events.event_service import EventService
  from maze.core.events.event_record import EventRecord
  from maze.core.events.pubsub import Pubsub, Subscriber
label_desc: Use image node_id 1 for calling the DummyInterface obj's underlying member method code with example usage: obj.event1() without return types