code: def testIssueRequests_RaiseValueErrorOnUnrecognizedRequestType(self):
      # Prepare requests and client.
      not_a_request = "i am a request"
      client = tensorflow_serving_client.TensorFlowServingClient(
          "localhost:1234", "a_model_name"
      )
  
      # Call
      with self.assertRaises(error_types.ValidationFailed):
          client.SendRequests([not_a_request])
  
imports: from typing import Any, Dict
  from unittest import mock
  import grpc
  import tensorflow
  from tfx.components.infra_validator import error_types
  from tfx.components.infra_validator import types
  from tfx.components.infra_validator.model_server_clients import tensorflow_serving_client
  from google.protobuf import json_format
  from tensorflow_serving.apis import classification_pb2
  from tensorflow_serving.apis import get_model_status_pb2
  from tensorflow_serving.apis import regression_pb2
label_desc: Use image node_id 9 for calling the TensorflowServingClientTest obj's underlying member method code with example usage: obj.testIssueRequests_RaiseValueErrorOnUnrecognizedRequestType() without return types