def test_set_upgrade_levels(mocker):
env = mock.Mock(data={"fuel_version": "9.1"})
node = mock.Mock()
mock_get_levels = mocker.patch("octane.util.nova.get_upgrade_levels")
mock_get_levels.return_value = "liberty"
mock_get_nodes = mocker.patch("octane.util.env.get_nodes")
mock_get_nodes.return_value = [node]
mock_add = mocker.patch("octane.util.node.add_compute_upgrade_levels")
mock_restart = mocker.patch("octane.util.node.restart_nova_services")
env_util.set_upgrade_levels(env)
mock_get_levels.assert_called_once_with("9.1")
mock_add.assert_called_once_with(node, "liberty")
mock_restart.assert_called_once_with(node)
mock_get_nodes.assert_called_once_with(env, ["controller", "compute"])