feat: ChatRoomEntity에 targetId와 type으로 고유키 설정

backend/src/main/java/mouda/backend/chat/entity/ChatRoomEntity.java

@@ -5,17 +5,26 @@
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import jakarta.persistence.Table;
+import jakarta.persistence.UniqueConstraint;
 import lombok.AccessLevel;
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import mouda.backend.chat.domain.ChatRoomType;
 
 @Entity
-@Table(name = "chat_room")
 @Getter
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Table(
+	name = "chat_room",
+	uniqueConstraints = {
+		@UniqueConstraint(
+			columnNames = {"target_id", "type"}
+		)
+	}
+)
 public class ChatRoomEntity {
+
 	@Id
 	@GeneratedValue(strategy = GenerationType.IDENTITY)
 	private Long id;

backend/src/test/java/mouda/backend/chat/entity/ChatRoomEntityTest.java

@@ -0,0 +1,55 @@
+package mouda.backend.chat.entity;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.dao.DataIntegrityViolationException;
+
+import mouda.backend.chat.infrastructure.ChatRoomRepository;
+import mouda.backend.common.fixture.ChatRoomEntityFixture;
+
+@SpringBootTest
+class ChatRoomEntityTest {
+
+	@Autowired
+	ChatRoomRepository chatRoomRepository;
+
+	@DisplayName("targetId와 type이 같은 ChatRoomEntity는 저장할 수 없다.")
+	@Test
+	void failToCreateDuplicatedUnique() {
+		ChatRoomEntity chatRoom = ChatRoomEntityFixture.getChatRoomEntityOfBet(1L, 1L);
+		chatRoomRepository.save(chatRoom);
+
+		ChatRoomEntity duplicated = ChatRoomEntityFixture.getChatRoomEntityOfBet(1L, 2L);
+
+		assertThatThrownBy(() -> chatRoomRepository.save(duplicated))
+			.isInstanceOf(DataIntegrityViolationException.class);
+	}
+
+	@DisplayName("targetId이 같아도 type이 다르다면 ChatRoomEntity는 저장할 수 있다.")
+	@Test
+	void createWithDifferentType() {
+		ChatRoomEntity chatRoom1 = ChatRoomEntityFixture.getChatRoomEntityOfBet(1L, 1L);
+		chatRoomRepository.save(chatRoom1);
+
+		ChatRoomEntity chatRoom2 = ChatRoomEntityFixture.getChatRoomEntityOfMoim(1L, 2L);
+		chatRoomRepository.save(chatRoom2);
+
+		assertThat(chatRoomRepository.findAll()).hasSize(2);
+	}
+
+	@DisplayName("type이 같아도 targetId이 다르다면 ChatRoomEntity는 저장할 수 있다.")
+	@Test
+	void createWithDifferentTargetId() {
+		ChatRoomEntity chatRoom1 = ChatRoomEntityFixture.getChatRoomEntityOfBet(1L, 1L);
+		chatRoomRepository.save(chatRoom1);
+
+		ChatRoomEntity chatRoom2 = ChatRoomEntityFixture.getChatRoomEntityOfBet(2L, 2L);
+		chatRoomRepository.save(chatRoom2);
+
+		assertThat(chatRoomRepository.findAll()).hasSize(2);
+	}
+}