[#52] feat: User follow 기능 구현 및 임시 테스트

src/main/java/com/study/realworld/user/domain/User.java

@@ -1,13 +1,19 @@
 package com.study.realworld.user.domain;
 
+import java.util.HashSet;
 import java.util.Objects;
 import java.util.Optional;
+import java.util.Set;
+import javax.persistence.CascadeType;
 import javax.persistence.Column;
 import javax.persistence.Embedded;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.JoinTable;
+import javax.persistence.ManyToMany;
 import javax.persistence.Table;
 import org.springframework.security.crypto.password.PasswordEncoder;
 
@@ -34,6 +40,12 @@ public class User {
     @Column(name = "image")
     private Image image;
 
+    @JoinTable(name = "follow",
+        joinColumns = @JoinColumn(name = "user_id"),
+        inverseJoinColumns = @JoinColumn(name = "follower_id"))
+    @ManyToMany(cascade = CascadeType.ALL)
+    private Set<User> followingUsers = new HashSet<>();
+
     protected User() {
     }
 
@@ -98,6 +110,10 @@ public void login(Password rawPassword, PasswordEncoder passwordEncoder) {
         this.password.matchPassword(rawPassword, passwordEncoder);
     }
 
+    public void followingUser(User user) {
+        followingUsers.add(user);
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) {

src/test/java/com/study/realworld/user/domain/UserTest.java

@@ -128,6 +128,30 @@ void passwordDismatchTest() {
             .withMessageMatching(ErrorCode.PASSWORD_DISMATCH.getMessage());
     }
 
+    // TODO : 테스트 구체화 필요
+    @Test
+    @DisplayName("특정 유저를 follow하여 following set에 저장할 수 있다.")
+    void followingTest() {
+
+        // given
+        User user = User.Builder()
+            .username(Username.of("username"))
+            .password(Password.of("password"))
+            .email(Email.of("[email protected]"))
+            .build();
+        User followingUser = User.Builder()
+            .username(Username.of("followingUser"))
+            .password(Password.of("password"))
+            .email(Email.of("[email protected]"))
+            .build();
+
+        // when
+        user.followingUser(followingUser);
+
+        // then
+        assertThat(user).isNotNull();
+    }
+
     @Test
     @DisplayName("equals hashCode 테스트")
     void userEqualsHashCodeTest() {