code: def testName(self, metric_class, expected_name):
      metric = metric_class()
      self.assertEqual(expected_name, metric.name)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tf_agents.metrics import py_metrics
  from tf_agents.trajectories import time_step
  from tf_agents.trajectories import trajectory
  from tf_agents.utils import nest_utils
label_desc: Use image node_id 1 for calling the PyMetricsTest obj's underlying member method code with example usage: obj.testName(metric_class, expected_name) without return types