[refactor] 유저 삭제 테스트 책임 이관 (#336)

src/test/java/org/sopt/app/application/UserServiceTest.java

@@ -65,16 +65,6 @@ void SUCCESS_upsertRegisteredUser() {
         Assertions.assertEquals(anyUserId, result);
     }
 
-    @Test
-    @DisplayName("SUCCESS_유저 삭제")
-    void SUCCESS_deleteUser() {
-        //given
-        User user = new User();
-
-        //then
-        Assertions.assertDoesNotThrow(() -> userService.deleteUser(user));
-    }
-
     @Test
     @DisplayName("SUCCESS_플레이그라운드 토큰 조회")
     void SUCCESS_getPlaygroundToken() {

src/test/java/org/sopt/app/application/UserWithdrawTest.java

@@ -0,0 +1,50 @@
+package org.sopt.app.application;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.verify;
+
+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.sopt.app.application.user.UserWithdrawService;
+import org.sopt.app.common.event.EventPublisher;
+import org.sopt.app.interfaces.postgres.UserRepository;
+
+@ExtendWith(MockitoExtension.class)
+class UserWithdrawTest {
+
+    @Mock
+    private EventPublisher eventPublisher;
+
+    @Mock
+    private UserRepository userRepository;
+
+    @InjectMocks
+    private UserWithdrawService userWithdrawService;
+
+    @Test
+    void SUCCESS_유저_탈퇴시_유저_삭제() {
+        //given
+        final Long userId = 1L;
+
+        // when
+        userWithdrawService.withdrawUser(userId);
+
+        //then
+        verify(userRepository).deleteById(userId);
+    }
+
+    @Test
+    void SUCCESS_유저_탈퇴시_스탬프_삭제_이벤트_발생() {
+        //given
+        final Long userId = 1L;
+
+        // when
+        userWithdrawService.withdrawUser(userId);
+
+        //then
+        verify(eventPublisher).raise(any());
+    }
+}