class_docstr: GRPCServer test
class_docstr_tok: ["GRPCServer","test"]
code: def tearDown(self):
      self.server.stop()
  
imports: import unittest
  import typing
  import asyncio
  from pydantic import BaseModel
  import numpy
  from towhee import api_service, pipe
  from towhee.serve.grpc.server import GRPCServer
  from towhee.serve.grpc.client import Client, AsyncClient
  from towhee.serve.io import JSON, NDARRAY, BYTES
  from towhee.utils.serializer import from_json
label_desc: Use image node_id 1 for calling the TestGRPC obj's underlying member method code with example usage: obj.tearDown() without return types