code: def test_tar_extension(self):
      self.assertDictEqual(
          {"team_id": 42},
          submissions.participant_from_submission_path("path/42.tar"),
      )
  
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 3 for calling the ParticipantFromSubmissionPathTest obj's underlying member method code with example usage: obj.test_tar_extension() without return types