@Test
void should_convert_empty_data_set_correctly() {

    DataSet emptyDataSet = new DataSet();
    RoutingProblem routingProblem = toDomain(emptyDataSet);
    assertThat(routingProblem.name()).isEmpty();
    assertThat(routingProblem.depot()).isEmpty();
    assertThat(routingProblem.vehicles()).isEmpty();
    assertThat(routingProblem.visits()).isEmpty();
}