code: def test_privacy_id_count_calls_aggregate_with_correct_params(
      self, mock_aggregate
  ):
      # Arrange
      dist_data = PrivateRDDTest.sc.parallelize(
          [(1, "pk1"), (2, "pk1")]
      )
      MetricsTuple = collections.namedtuple(
          "MetricsTuple", ["privacy_id_count"]
      )
      mock_aggregate.return_value = PrivateRDDTest.sc.parallelize(
          [("pk1", MetricsTuple(privacy_id_count=2))]
      )
      budget_accountant = budget_accounting.NaiveBudgetAccountant(
          1, 1e-10
      )
  
      def privacy_id_extractor(x):
          return x[0]
  
      prdd = private_spark.make_private(
          dist_data, budget_accountant, privacy_id_extractor
      )
      privacy_id_count_params = agg.PrivacyIdCountParams(
          noise_kind=pipeline_dp.NoiseKind.GAUSSIAN,
          max_partitions_contributed=2,
          budget_weight=1,
          partition_extractor=lambda x: x[1],
      )
  
      # Act
      actual_result = prdd.privacy_id_count(privacy_id_count_params)
  
      # Assert
      mock_aggregate.assert_called_once()
      args = mock_aggregate.call_args[0]
  
      rdd = dist_data.map(lambda x: (privacy_id_extractor(x), x))
      self.assertListEqual(args[0].collect(), rdd.collect())
  
      params = pipeline_dp.AggregateParams(
          noise_kind=pipeline_dp.NoiseKind.GAUSSIAN,
          metrics=[pipeline_dp.Metrics.PRIVACY_ID_COUNT],
          max_partitions_contributed=privacy_id_count_params.max_partitions_contributed,
          max_contributions_per_partition=1,
      )
      self.assertEqual(args[1], params)
  
      self.assertEqual([("pk1", 2)], actual_result.collect())
  
imports: import pyspark
  from pyspark import SparkContext
  from absl.testing import parameterized
  from unittest.mock import patch
  import unittest
  import sys
  import collections
  import pipeline_dp
  from pipeline_dp import aggregate_params
  from pipeline_dp import budget_accounting, private_spark
label_desc: Use image node_id 18 for calling the PrivateRDDTest obj's underlying member method code with example usage: obj.test_privacy_id_count_calls_aggregate_with_correct_params(mock_aggregate) and returns: x