code: def test_update_example(self):
      self.plugin.examples = [tf.train.Example()]
      example = self.get_fake_example()
      response = self.server.post(
          "/data/plugin/whatif/update_example",
          data=dict(
              example=json_format.MessageToJson(example), index="0"
          ),
      )
      self.assertEqual(200, response.status_code)
      self.assertEqual(example, self.plugin.examples[0])
      self.assertTrue(0 in self.plugin.updated_example_indices)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import json
  import os
  import sys
  import numpy
  import tensorflow
  from six.moves import urllib_parse
  from google.protobuf import json_format
  from tensorflow_serving.apis import regression_pb2
  from werkzeug import test
  from werkzeug import wrappers
  from tensorboard.backend import application
  from tensorboard.backend.event_processing import plugin_event_multiplexer
  from tensorboard.plugins import base_plugin
  from utils import inference_utils
  from utils import platform_utils
  from utils import test_utils
  import wit_plugin
label_desc: Use image node_id 5 for calling the InferencePluginTest obj's underlying member method code with example usage: obj.test_update_example() without return types