code: def test_merge_partition_selection_utilities(self):
      metrics1 = _get_partition_metrics(coef=1)
      metrics2 = _get_partition_metrics(coef=2)
      expected_utility = _get_partition_metrics(coef=3)
      cross_partition_combiners._merge_partition_metrics(
          metrics1, metrics2
      )
      self.assertEqual(metrics1, expected_utility)
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  import dataclasses
  import math
  from unittest import mock
  from unittest.mock import patch
  from analysis import metrics
  from analysis import cross_partition_combiners
  import pipeline_dp
label_desc: Use image node_id 1 for calling the MergeMetricsTests obj's underlying member method code with example usage: obj.test_merge_partition_selection_utilities() without return types