code: def test_count_merge(self, **kwargs):
      count_accumulator = accumulator.CountAccumulator([])
      total_count = 0
      for data in kwargs.values():
          total_count += len(data)
          count_accumulator.add_accumulator(
              accumulator.CountAccumulator(data)
          )
      self.assertEqual(count_accumulator.compute_metrics(), total_count)
  
file_path: pipelinedp/utility_analysis/tests/raw_accumulator_test.py
imports: from absl.testing import absltest
  from absl.testing import parameterized
  import pipeline_dp
  from utility_analysis import raw_accumulator
label_desc: Use image node_id 2 for calling the AccumulatorTest obj's underlying member method code with example usage: obj.test_count_merge() without return types