async def METHOD_NAME(self):
    r1 = Router()
    r2 = Router()
    async def handler(evt):
        return evt
    r1.include_router(r2)
    r1.message.filter(lambda evt: False)
    r2.message.register(handler)
    assert await r1.propagate_event(update_type="message", event=None) is UNHANDLED