code: def test_update_work_as_completed(self):
      self.reset_work_pieces()
      self.work_pieces.work["w10"] = self.work1
      self.work_pieces.work["w20"] = self.work2
      self.work2["claimed_worker_id"] = "this_worker"
      self.work2[
          "claimed_worker_start_time"
      ] = work_data.get_integer_time()
      self.work_pieces.write_all_to_datastore()
      self.assertTrue(
          self.work_pieces.update_work_as_completed(
              "this_worker", "w20"
          )
      )
      self.reset_work_pieces()
      self.work_pieces.read_all_from_datastore()
      self.assertTrue(self.work_pieces.work["w20"]["is_completed"])
      self.assertNotIn("error", self.work_pieces.work["w20"])
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import copy
  import unittest
  from six import assertCountEqual
  from six import itervalues
  from eval_lib import work_data
  from eval_lib.tests import fake_cloud_client
label_desc: Use image node_id 16 for calling the WorkPiecesBaseTest obj's underlying member method code with example usage: obj.test_update_work_as_completed() without return types