Test: AttachmentMappingRepository 테스트 케이스 추가

- AttachmentMapping이 삭제되면 연관된 FileAttachment도 같이 삭제되는지 체크

Author: namgigun

src/test/java/com/back/domain/file/repository/AttachmentMappingRepositoryTest.java

@@ -0,0 +1,54 @@
+package com.back.domain.file.repository;
+
+import com.back.domain.file.entity.AttachmentMapping;
+import com.back.domain.file.entity.EntityType;
+import com.back.domain.file.entity.FileAttachment;
+import jakarta.persistence.EntityManager;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.mock.web.MockMultipartFile;
+import org.springframework.transaction.annotation.Transactional;
+
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest
+@Transactional
+class AttachmentMappingRepositoryTest {
+    @Autowired
+    private FileAttachmentRepository fileAttachmentRepository;
+    @Autowired
+    private AttachmentMappingRepository attachmentMappingRepository;
+    @Autowired
+    private EntityManager em;
+
+    @Test
+    void AttachmentMapping_삭제시_FileAttachment_자동삭제_확인() throws Exception {
+        // given
+        FileAttachment fileAttachment = new FileAttachment(
+                "test",
+                new MockMultipartFile("test", "test", "image", "test".getBytes()),
+                null,
+                "test.URL"
+        );
+        fileAttachmentRepository.save(fileAttachment);
+        System.out.println("현재 저장된 파일 개수 : " + fileAttachmentRepository.findAll().size());
+
+        AttachmentMapping attachmentMapping = new AttachmentMapping(
+                fileAttachment,
+                EntityType.POST,
+                1L
+        );
+        attachmentMappingRepository.save(attachmentMapping);
+
+        // when
+        attachmentMappingRepository.deleteAllByEntityTypeAndEntityId(EntityType.POST, 1L);
+
+        em.flush(); // 즉시 DB에 변경사항 반영
+        em.clear(); // 영속성 컨텍스트 초기화
+
+        // then
+        assertThat(fileAttachmentRepository.findAll().size()).isEqualTo(0);
+    }
+}