def METHOD_NAME(self):
    context = self.docker_ssh(
        username='mitogen__has_sudo_pubkey',
        identity_file=testlib.data_path('docker/mitogen__has_sudo_pubkey.key'),
    )
    self.assertEqual(
        'i-am-mitogen-test-docker-image\n',
        context.call(plain_old_module.get_sentinel_value),
    )