[#70] feat: Article 좋아요, 좋아요취소 기능 구현 및 테스트

src/main/java/com/study/realworld/article/domain/Article.java

@@ -16,6 +16,7 @@
 import javax.persistence.JoinColumn;
 import javax.persistence.ManyToOne;
 import javax.persistence.Table;
+import javax.persistence.Transient;
 import org.hibernate.annotations.Where;
 
 @Entity
@@ -34,6 +35,12 @@ public class Article extends BaseTimeEntity {
     @ManyToOne(fetch = FetchType.LAZY)
     private User author;
 
+    @Embedded
+    private FavoritingUsers favoritingUsers = new FavoritingUsers();
+
+    @Transient
+    private boolean favorited;
+
     protected Article() {
     }
 
@@ -70,6 +77,10 @@ public User author() {
         return author;
     }
 
+    public boolean isFavorited() {
+        return favorited;
+    }
+
     public void changeTitle(Title title) {
         articleContent.changeTitle(title);
     }
@@ -82,6 +93,18 @@ public void changeBody(Body body) {
         articleContent.changeBody(body);
     }
 
+    public boolean updateFavoritedByUser(User user) {
+        return favorited = favoritingUsers.isFavorite(user);
+    }
+
+    public void favoritingByUser(User user) {
+        favoritingUsers.favoritingByUser(user);
+    }
+
+    public void unfavoritingByUser(User user) {
+        favoritingUsers.unfavoritingByUser(user);
+    }
+
     public void deleteArticle() {
         saveDeletedTime(OffsetDateTime.now());
     }

src/test/java/com/study/realworld/article/domain/ArticleTest.java

@@ -2,6 +2,8 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.assertAll;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import com.study.realworld.tag.domain.Tag;
 import com.study.realworld.user.domain.Bio;
@@ -106,6 +108,43 @@ void deleteArticleTest() {
         assertThat(result).isAfter(startTime).isBefore(endTime);
     }
 
+    @Test
+    @DisplayName("유저가 글을 좋아요할 수 있다.")
+    void favoritingByUserTest() {
+
+        // given
+        Article article = Article.from(articleContent, author);
+        User user = User.Builder()
+            .email(Email.of("[email protected]"))
+            .build();
+        article.favoritingByUser(user);
+
+        // when
+        boolean result = article.updateFavoritedByUser(user);
+
+        // then
+        assertTrue(result);
+    }
+
+    @Test
+    @DisplayName("유저가 글을 좋아요 취소할 수 있다.")
+    void unfavoritingByUserTest() {
+
+        // given
+        Article article = Article.from(articleContent, author);
+        User user = User.Builder()
+            .email(Email.of("[email protected]"))
+            .build();
+        article.favoritingByUser(user);
+        article.unfavoritingByUser(user);
+
+        // when
+        boolean result = article.updateFavoritedByUser(user);
+
+        // then
+        assertFalse(result);
+    }
+
     @Test
     @DisplayName("equals hashCode 테스트")
     void articleEqualsHashCodeTest() {