fix(user): turn update agreement api into writable trasaction

src/main/java/com/goolbitg/api/service/UserServiceImpl.java

@@ -314,6 +314,7 @@ public UserRegisterStatusDto getRegisterStatus(String userId) {
     }
 
     @Override
+    @Transactional
     public void updateAgreementInfo(String userId, UserAgreementDto request) {
         // TODO: throw error when required agreement is not agreed
         Optional<User> result = userRepository.findById(userId);

src/test/java/com/goolbitg/api/integration/BuyOrNotIntegrationTest.java

@@ -0,0 +1,32 @@
+package com.goolbitg.api.integration;
+
+import jakarta.transaction.Transactional;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.security.test.context.support.WithMockUser;
+import org.springframework.test.web.servlet.MockMvc;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * BuyOrNotIntegrationTest
+ */
+@CustomIntegrationTest
+public class BuyOrNotIntegrationTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+    @Autowired
+    private  ObjectMapper mapper;
+
+    private final String ROOT_USER_ID = "id0001";
+    private final String NORMAL_USER_ID = "id0002";
+
+    @Test
+    @Transactional
+    @WithMockUser(ROOT_USER_ID)
+    void get_buyOrNots() throws Exception {
+
+    }
+}