code: def testBuildsSummary(self):
      if tf.executing_eagerly():
          self.skipTest("b/123881100")
      metric = DummyMetric()
      self.assertIsNone(metric.summary_op)
      metric.tf_summaries(train_step=self.global_step)
      self.assertIsNotNone(metric.summary_op)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import tempfile
  import tensorflow
  from tf_agents.metrics import py_metric
label_desc: Use image node_id 2 for calling the PyMetricSummariesTest obj's underlying member method code with example usage: obj.testBuildsSummary() without return types