self = <apache_beam.runners.portability.portable_runner_test.PortableRunnerTestWithSubprocessesAndMultiWorkers testMethod=test_assert_that>

    def test_assert_that(self):
      # TODO: figure out a way for fn_api_runner to parse and raise the
      # underlying exception.
      with self.assertRaisesRegex(Exception, 'Failed assert'):
        with self.create_pipeline() as p:
>         assert_that(p | beam.Create(['a', 'b']), equal_to(['a']))
E         AssertionError: "Failed assert" does not match "Pipeline timed out waiting for job service subprocess."