fix: 동일한 유저가 서로 다른 주문을 동시에 수행하도록 테스트 수정

Author: yeonjiyeon

apps/commerce-api/src/test/java/com/loopers/application/order/OrderConcurrencyTest.java

@@ -51,25 +51,27 @@ void tearDown() {
   class PointConcurrency {
 
     private User savedUser;
-    private Product savedProduct;
+    private List<Product> distinctProducts;
 
     @BeforeEach
     void setUp() {
       User user = new User("testUser", "test@email.com", "1990-01-01", User.Gender.MALE,
           new Point(10000L));
       this.savedUser = userJpaRepository.saveAndFlush(user);
 
-      Product product = new Product(1l, "테스트상품", "상품 설명", new Money(1000L), 100);
-      this.savedProduct = productJpaRepository.saveAndFlush(product);
+      this.distinctProducts = IntStream.range(0, 10)
+          .mapToObj(i -> {
+            Product product = new Product(1l, "상품" + i, "설명", new Money(1000L), 100);
+            return productJpaRepository.saveAndFlush(product);
+          })
+          .toList();
     }
 
     @Test
     @DisplayName("동시에 10번 주문 시, 비관적 락으로 인해 포인트는 순차적으로 정확히 차감되어야 한다.")
     void point_deduction_concurrency_test() throws InterruptedException {
       // arrange
       int threadCount = 10;
-      PlaceOrder command = new PlaceOrder(savedUser.getId(),
-          List.of(new Item(savedProduct.getId(), 1)));
 
       ExecutorService executorService = Executors.newFixedThreadPool(32);
       CountDownLatch latch = new CountDownLatch(threadCount);
@@ -79,8 +81,12 @@ void point_deduction_concurrency_test() throws InterruptedException {
 
       // act
       for (int i = 0; i < threadCount; i++) {
+        final int index = i;
         executorService.submit(() -> {
           try {
+            Product targetProduct = distinctProducts.get(index);
+            PlaceOrder command = new PlaceOrder(savedUser.getId(),
+                List.of(new Item(targetProduct.getId(), 1)));
             orderFacade.placeOrder(command);
             successCount.getAndIncrement();
           } catch (Exception e) {