@Test
void portable_routing_plan_empty() {

    PortableRoutingPlan portablePlan = PortableRoutingPlanFactory.fromRoutingPlan(RoutingPlan.empty());
    assertThat(portablePlan.getDistance()).isEqualTo(PortableDistance.fromDistance(Distance.ZERO));
    assertThat(portablePlan.getVehicles()).isEmpty();
    assertThat(portablePlan.getDepot()).isNull();
    assertThat(portablePlan.getRoutes()).isEmpty();
}