@Test
void fail_fast_if_working_object_is_null() {

    ChangeVehicleCapacity changeVehicleCapacity = new ChangeVehicleCapacity(PlanningVehicleFactory.testVehicle(1));
    assertThatIllegalStateException()
            .isThrownBy(() -> changeVehicleCapacity.doChange(scoreDirector))
            .withMessageContaining("working copy of");
}