code: def test_create_grpc_stub():
      assert isinstance(create_grpc_stub(), PredictionServiceStub)
  
imports: from unittest.mock import MagicMock, patch
  import numpy
  from tensorflow_serving.apis.prediction_service_pb2_grpc import PredictionServiceStub
  from chitra.serve.tf_serving.client import GrpcClient, create_grpc_stub, grpc_request
label_desc: Use image node_id 1 for calling a global function with example usage: test_create_grpc_stub() without return types