Mockito 를 사용하여 테스트할 때, 테스트 요구사항의 반영 질문

@ExtendWith(MockitoExtension.class)
class OrderServiceTest {

    @Mock
    MemberRepository memberRepository;

    @Mock
    ItemRepository itemRepository;

    @Mock
    OrderRepository orderRepository;

    @InjectMocks
    OrderService orderService;

    @Test
    @DisplayName("주문 성공")
    void order() {
        Member member = new Member(
                1L,
                "irostub",
                new Address("seoul", "street", "10000"),
                new ArrayList<>());
        Item item = new Book(
                1L,
                "itemName",
                15000,
                2021,
                new ArrayList<>(),
                "5pg",
                "isbn5100");

        //given
        given(memberRepository.findOne(anyLong()))
                .willReturn(member);
        given(itemRepository.findOne(anyLong()))
                .willReturn(item);

        //when
        orderService.order(1L, 1L, 100);

        //then
        ArgumentCaptor<Order> captor = ArgumentCaptor.forClass(Order.class);
        then(orderRepository).should(times(1)).save(captor.capture());
    }
}