code: def test_scalars_multirun_single_run(self):
      # Checks for any problems with singleton arrays.
      server = self.load_server(
          [
              self._RUN_WITH_SCALARS,
              self._RUN_WITH_SCALARS_2,
              self._RUN_WITH_SCALARS_3,
          ]
      )
      response = server.post(
          "/data/plugin/scalars/scalars_multirun",
          data={
              "tag": "%s/scalar_summary" % self._SCALAR_TAG,
              "runs": [self._RUN_WITH_SCALARS],
          },
      )
      self.assertEqual(200, response.status_code)
      self.assertEqual(
          "application/json", response.headers["Content-Type"]
      )
      data = json.loads(response.get_data())
      self.assertCountEqual([self._RUN_WITH_SCALARS], data)
      self.assertLen(data[self._RUN_WITH_SCALARS], self._STEPS)
  
imports: import csv
  import io
  import json
  import os.path
  import tensorflow
  from werkzeug import test
  from werkzeug import wrappers
  from tensorboard.backend import application
  from tensorboard.backend.event_processing import data_provider
  from tensorboard.backend.event_processing import plugin_event_multiplexer
  from tensorboard.backend.event_processing import tag_types
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.scalar import scalars_plugin
  from tensorboard.plugins.scalar import summary
  from tensorboard.util import test_util
label_desc: Use image node_id 11 for calling the ScalarsPluginTest obj's underlying member method code with example usage: obj.test_scalars_multirun_single_run() without return types