test: Add test code

src/test/java/com/dnd/accompany/domain/user/service/UserServiceTest.java

@@ -0,0 +1,95 @@
+package com.dnd.accompany.domain.user.service;
+
+import com.dnd.accompany.domain.auth.dto.AuthUserInfo;
+import com.dnd.accompany.domain.auth.oauth.dto.OAuthUserDataResponse;
+import com.dnd.accompany.domain.auth.oauth.dto.OAuthUserInfo;
+import com.dnd.accompany.domain.user.entity.User;
+import com.dnd.accompany.domain.user.infrastructure.UserRepository;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.test.util.ReflectionTestUtils;
+
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class UserServiceTest {
+
+    @Mock
+    private UserRepository userRepository;
+
+    @InjectMocks
+    private UserService userService;
+
+    private OAuthUserDataResponse oAuthUserDataResponse;
+
+    private OAuthUserInfo oauthUserInfo;
+
+    @BeforeEach
+    void setup() {
+        oAuthUserDataResponse = OAuthUserDataResponse.builder()
+                .provider("KAKAO")
+                .nickname("TESTER1")
+                .oauthId("KA-123")
+                .email("[email protected]")
+                .build();
+
+        oauthUserInfo = OAuthUserInfo.from(oAuthUserDataResponse);
+    }
+
+    @Test
+    @DisplayName("getOrRegister 호출 시 User 정보가 없다면 유저 데이터를 저장한다.")
+    void success() {
+        //given
+        User newUser = User.of(
+                oauthUserInfo.getEmail(),
+                oauthUserInfo.getNickname(),
+                oauthUserInfo.getProvider(),
+                oauthUserInfo.getOauthId()
+        );
+
+        ReflectionTestUtils.setField(newUser, "id", 1L);
+
+        when(userRepository.findUserByProviderAndOauthId(oauthUserInfo.getProvider(), oauthUserInfo.getOauthId())).thenReturn(Optional.empty());
+        when(userRepository.save(any(User.class))).thenReturn(newUser);
+
+        //when
+        AuthUserInfo result = userService.getOrRegister(oauthUserInfo);
+
+        //then
+        verify(userRepository).save(any(User.class)); // Ensure save was called
+        assertEquals(newUser.getId(), result.getUserId());
+    }
+
+    @Test
+    @DisplayName("getOrRegister 호출 시 User 정보가 있다면 유저 데이터를 저장하지 않는다.")
+    void success2() {
+        //given
+        User existingUser = User.of(
+                oauthUserInfo.getEmail(),
+                oauthUserInfo.getNickname(),
+                oauthUserInfo.getProvider(),
+                oauthUserInfo.getOauthId()
+        );
+
+        ReflectionTestUtils.setField(existingUser, "id", 1L);
+
+        when(userRepository.findUserByProviderAndOauthId(oauthUserInfo.getProvider(), oauthUserInfo.getOauthId()))
+                .thenReturn(Optional.of(existingUser));
+
+        //when
+        AuthUserInfo result = userService.getOrRegister(oauthUserInfo);
+
+        //then
+        verify(userRepository, never()).save(any(User.class));
+        assertEquals(existingUser.getId(), result.getUserId());
+    }
+}