투표 선택지 제목 길이 10글자 제한 추가

src/main/java/com/chooz/common/exception/ErrorCode.java

@@ -20,6 +20,7 @@ public enum ErrorCode {
     TITLE_IS_REQUIRED("게시글 제목은 필수입니다."),
     TITLE_LENGTH_EXCEEDED("게시글 제목 길이가 초과했습니다."),
     INVALID_POLL_CHOICE_COUNT("투표 선택지 개수가 범위를 벗어났습니다."),
+    POLL_CHOICE_TITLE_LENGTH_EXCEEDED("투표 선택지 제목 길이가 초과했습니다."),
     NOT_POST_AUTHOR("게시글 작성자가 아닙니다."),
     POST_ALREADY_CLOSED("이미 마감된 게시글입니다."),
     FILE_NAME_TOO_LONG("파일 이름이 너무 깁니다."),

src/main/java/com/chooz/post/domain/PollChoice.java

@@ -1,5 +1,7 @@
 package com.chooz.post.domain;
 
+import com.chooz.common.exception.BadRequestException;
+import com.chooz.common.exception.ErrorCode;
 import jakarta.persistence.Entity;
 import jakarta.persistence.FetchType;
 import jakarta.persistence.GeneratedValue;
@@ -19,6 +21,8 @@
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 public class PollChoice {
 
+    private static final int MAX_TITLE_LENGTH = 10;
+
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -32,6 +36,7 @@ public class PollChoice {
 
     public PollChoice(Long id, Post post, String title, String imageUrl) {
         validateNull(title, imageUrl);
+        validateTitleLength(title);
         this.id = id;
         this.post = post;
         this.title = title;
@@ -46,4 +51,10 @@ public void setPost(Post post) {
         validateNull(post);
         this.post = post;
     }
+
+    private void validateTitleLength(String title) {
+        if (title.length() > MAX_TITLE_LENGTH) {
+            throw new BadRequestException(ErrorCode.POLL_CHOICE_TITLE_LENGTH_EXCEEDED);
+        }
+    }
 }

src/test/java/com/chooz/post/domain/PollChoiceTest.java

@@ -1,5 +1,6 @@
 package com.chooz.post.domain;
 
+import com.chooz.common.exception.BadRequestException;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
@@ -24,4 +25,31 @@ void create() throws Exception {
                 () -> assertThat(pollChoice.getImageUrl()).isEqualTo(imageUrl)
         );
     }
+
+    @Test
+    @DisplayName("투표 선택지 제목은 10자를 초과할 수 없다")
+    void createWithTitleExceedingMaxLength() throws Exception {
+        //given
+        String title = "12345678901"; // 11자
+        String imageUrl = "https://example.com/image.jpg";
+
+        //when & then
+        assertThrows(BadRequestException.class, () -> {
+            PollChoice.create(title, imageUrl);
+        });
+    }
+
+    @Test
+    @DisplayName("투표 선택지 제목은 10자일 때 정상 생성된다")
+    void createWithTitleMaxLength() throws Exception {
+        //given
+        String title = "1234567890"; // 10자
+        String imageUrl = "https://example.com/image.jpg";
+
+        //when
+        PollChoice pollChoice = PollChoice.create(title, imageUrl);
+
+        //then
+        assertThat(pollChoice.getTitle()).isEqualTo(title);
+    }
 }