code: def test_size_accounts_for_duplicates(self):
      col = [3, 2, 1, 1]
  
      result = composite_funcs.size(
          self.backend, col, stage_name="Size"
      )
  
      self.assertEqual([4], list(result))
  
imports: import sys
  import unittest
  from dataclasses import dataclass
  from typing import List
  import apache_beam
  import apache_beam.testing.test_pipeline
  import apache_beam.testing.util
  from absl.testing import parameterized
  import pipeline_dp
  from pipeline_dp import pipeline_functions
  from pipeline_dp import pipeline_backend
label_desc: Use image node_id 3 for calling the MultiProcLocalBackendTest obj's underlying member method code with example usage: obj.test_size_accounts_for_duplicates() without return types