code: def test_read_from_datastore(self):
      self.reset_work_pieces()
      self.work_pieces.work["w10"] = self.work1
      self.work_pieces.work["w20"] = self.work2
      self.work_pieces.write_all_to_datastore()
      self.reset_work_pieces()
      self.work_pieces.read_all_from_datastore()
      # verify data
      self.assertDictEqual(
          {"w10": self.work1, "w20": self.work2}, self.work_pieces.work
      )
  
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 5 for calling the WorkPiecesBaseTest obj's underlying member method code with example usage: obj.test_read_from_datastore() without return types