code: def test_grpc_options():
      """Test gRPCOptions.
  
      When the gRPCOptions object is created, the default values are set correctly. When
      the gRPCOptions object is created with user-specified values, the values are set
      correctly. Also, if the user provided an invalid grpc_servicer_function, it
      raises errors.
      """
      default_grpc_options = gRPCOptions()
      assert default_grpc_options.port == DEFAULT_GRPC_PORT
      assert default_grpc_options.grpc_servicer_functions == []
      assert default_grpc_options.grpc_servicer_func_callable == []
  
      port = 9001
      grpc_servicer_functions = [
          "ray.serve.generated.serve_pb2_grpc.add_UserDefinedServiceServicer_to_server",
      ]
      grpc_options = gRPCOptions(
          port=port,
          grpc_servicer_functions=grpc_servicer_functions,
      )
      assert grpc_options.port == port
      assert (
          grpc_options.grpc_servicer_functions
          == grpc_servicer_functions
      )
      assert grpc_options.grpc_servicer_func_callable == [
          add_UserDefinedServiceServicer_to_server
      ]
  
      # Import not found should raise ModuleNotFoundError.
      grpc_servicer_functions = ["fake.service.that.does.not.exist"]
      with pytest.raises(ModuleNotFoundError) as exception:
          grpc_options = gRPCOptions(
              grpc_servicer_functions=grpc_servicer_functions
          )
          grpc_options.grpc_servicer_func_callable
      assert "can't be imported!" in str(exception)
  
      # Not callable should raise ValueError.
      grpc_servicer_functions = [
          "ray.serve._private.constants.DEFAULT_HTTP_PORT"
      ]
      with pytest.raises(ValueError) as exception:
          grpc_options = gRPCOptions(
              grpc_servicer_functions=grpc_servicer_functions
          )
          grpc_options.grpc_servicer_func_callable
      assert "is not a callable function!" in str(exception)
  
imports: import pytest
  from ray import cloudpickle
  from ray._private.pydantic_compat import ValidationError
  from ray._private.utils import import_attr
  from ray.serve._private.config import DeploymentConfig, ReplicaConfig, _proto_to_dict
  from ray.serve._private.constants import DEFAULT_AUTOSCALING_POLICY, DEFAULT_GRPC_PORT
  from ray.serve._private.utils import DEFAULT
  from ray.serve.autoscaling_policy import default_autoscaling_policy
  from ray.serve.config import AutoscalingConfig, DeploymentMode, HTTPOptions, ProxyLocation, gRPCOptions
  from ray.serve.generated.serve_pb2 import AutoscalingConfig
  from ray.serve.generated.serve_pb2 import DeploymentConfig
  from ray.serve.generated.serve_pb2 import DeploymentLanguage
  from ray.serve.generated.serve_pb2_grpc import add_UserDefinedServiceServicer_to_server
  from ray.serve.schema import DeploymentSchema, HTTPOptionsSchema, ServeApplicationSchema, ServeDeploySchema
label_desc: Use image node_id 7 for calling a global function with example usage: test_grpc_options() without return types