code: def test_generate(self):
      report = pipeline_dp.ExplainComputationReport()
      params = pipeline_dp.AggregateParams(
          noise_kind=pipeline_dp.NoiseKind.LAPLACE,
          metrics=[pipeline_dp.Metrics.COUNT],
          max_partitions_contributed=2,
          max_contributions_per_partition=1,
      )
      report_generator = ReportGenerator(params, "test_method")
      report_generator.add_stage("stage 1")
      report_generator.add_stage("stage 2")
      report._set_report_generator(report_generator)
  
      text = report.text()
      self.assertTrue("stage 1" in text)
      self.assertTrue("stage 2" in text)
  
file_path: pipelinedp/tests/report_generator_test.py
imports: import unittest
  import pipeline_dp
  from pipeline_dp.aggregate_params import AggregateParams, Metrics
  from pipeline_dp.report_generator import ReportGenerator
label_desc: Use image node_id 3 for calling the ExplainComputationReportTest obj's underlying member method code with example usage: obj.test_generate() without return types