code: def test_merge_utility_reports(self):
      report1 = _get_utility_report(coef=2)
      report2 = _get_utility_report(coef=5)
      expected_report = _get_utility_report(coef=7)
      cross_partition_combiners._merge_utility_reports(report1, report2)
      self.assertEqual(report1, expected_report)
  
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 3 for calling the MergeMetricsTests obj's underlying member method code with example usage: obj.test_merge_utility_reports() without return types