주문 서비스 테스트를 하고 있는데 어디에서 잘못된건지 잘 모르겠습니다..

package jpabook.jpashop.service;

import jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceContext;
import jpabook.jpashop.domain.Address;
import jpabook.jpashop.domain.Member;
import jpabook.jpashop.domain.Order;
import jpabook.jpashop.domain.OrderStatus;
import jpabook.jpashop.domain.item.Book;
import jpabook.jpashop.domain.item.Item;
import jpabook.jpashop.exception.NotEnoughStockException;
import jpabook.jpashop.repository.OrderRepository;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.transaction.annotation.Transactional;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
@RunWith(SpringRunner.class)
@SpringBootTest
@Transactional
public class OrderServiceTest {
    @PersistenceContext
    EntityManager em;
    @Autowired OrderService orderService;
    @Autowired OrderRepository orderRepository;
    @Test
    public void 상품주문() throws Exception {
        //Given
        Member member = createMember();
        Item item = createBook("시골 JPA", 10000, 10); //이름, 가격, 재고
        int orderCount = 2;
        //When
        Long orderId = orderService.order(member.getId(), item.getId(),
                orderCount);
//Then
        Order getOrder = orderRepository.findOne(orderId);
        assertEquals("상품 주문시 상태는 ORDER",OrderStatus.ORDER,
                getOrder.getStatus());
        assertEquals("주문한 상품 종류 수가 정확해야 한다.",1,
                getOrder.getOrderItems().size());
        assertEquals("주문 가격은 가격 * 수량이다.", 10000 * 2,
                getOrder.getTotalPrice());
        assertEquals("주문 수량만큼 재고가 줄어야 한다.",8, item.getStockQuantity());
    }
    @Test(expected = NotEnoughStockException.class)
    public void 상품주문_재고수량초과() throws Exception {
        //...
    }
    @Test
    public void 주문취소() {
        //...
    }
    private Member createMember() {
        Member member = new Member();
        member.setName("회원1");
        member.setAddress(new Address("서울", "강가", "123-123"));
        em.persist(member);
        return member;
    }
    private Book createBook(String name, int price, int stockQuantity) {
        Book book = new Book();
        book.setName(name);
        book.setStockQuantity(stockQuantity);
        book.setPrice(price);
        em.persist(book);
        return book;
    }
}

예상 개수가 8개이고 결과는 2개가 나오는데 이게 어디서 수정을 해줘야 할 지 감이 안 잡힙니다.. 

java.lang.AssertionError: 주문 수량만큼 재고가 줄어야 한다.

Expected :8

Actual :2

<Click to see difference>

at org.junit.Assert.fail(Assert.java:89)

at org.junit.Assert.failNotEquals(Assert.java:835)

at org.junit.Assert.assertEquals(Assert.java:647)

at jpabook.jpashop.service.OrderServiceTest.상품주문(OrderServiceTest.java:47)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)

at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.base/java.lang.reflect.Method.invoke(Method.java:568)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:76)

at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)

at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)

at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)

at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)

at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)

at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)

at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)

at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)

at org.junit.runners.ParentRunner.run(ParentRunner.java:413)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)

at org.junit.runner.JUnitCore.run(JUnitCore.java:137)

at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)

at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)

at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)

at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)

at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)

at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)