code: def test_time_series_unmatching_request(self):
      self._write_scalar_data("run1", "scalars/tagA", [0, 100, -200])
  
      self._multiplexer.Reload()
  
      requests = [{"plugin": "scalars", "tag": "nothing-matches"}]
      response = self._plugin._time_series_impl(
          context.RequestContext(), "", requests
      )
      clean_response = self._clean_time_series_responses(response)
  
      self.assertEqual(
          [
              {
                  "plugin": "scalars",
                  "runToSeries": {},
                  "tag": "nothing-matches",
              }
          ],
          clean_response,
      )
  
imports: import argparse
  import collections.abc
  import os.path
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorboard import context
  from tensorboard.backend.event_processing import data_provider
  from tensorboard.backend.event_processing import plugin_event_multiplexer
  from tensorboard.data import provider
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.image import metadata
  from tensorboard.plugins.metrics import metrics_plugin
label_desc: Use image node_id 18 for calling the MetricsPluginTest obj's underlying member method code with example usage: obj.test_time_series_unmatching_request() without return types