code: def test_init_from_datastore(self):
      # first we need to populate datastore
      self.submissions.init_from_storage_write_to_datastore()
      # now reset submission class and load data from datastore
      self.submissions = submissions.CompetitionSubmissions(
          datastore_client=self.datastore_client,
          storage_client=self.storage_client,
          round_name=ROUND_NAME,
      )
      self.assertFalse(self.submissions.attacks)
      self.assertFalse(self.submissions.targeted_attacks)
      self.assertFalse(self.submissions.defenses)
      self.submissions.init_from_datastore()
      self.verify_submissions()
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import unittest
  from six import assertCountEqual
  from eval_lib import submissions
  from eval_lib.tests import fake_cloud_client
label_desc: Use image node_id 5 for calling the SubmissionsTest obj's underlying member method code with example usage: obj.test_init_from_datastore() without return types