test(VolunteerSignController): OAuth 로그인 및 로그아웃 통합 테스트 추가

- 유효한 OAuth 제공자로 로그인 URL 생성 테스트 추가
- 지원되지 않는 OAuth 제공자에 대해 400 에러 반환 테스트 추가
- 로그아웃 요청 시 성공 메시지 반환 테스트 추가

Author: m-a-king

src/test/java/com/somemore/volunteer/controller/VolunteerSignControllerTest.java

@@ -0,0 +1,66 @@
+package com.somemore.volunteer.controller;
+
+import com.somemore.IntegrationTestSupport;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.mock.web.MockHttpServletResponse;
+import org.springframework.test.web.servlet.MockMvc;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+class VolunteerSignControllerTest extends IntegrationTestSupport {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    @DisplayName("유효한 OAuth 제공자로 로그인 URL을 생성한다.")
+    void signInWithValidProvider() throws Exception {
+        // Given
+        String oauthProvider = "naver";
+
+        // When
+        // Then
+        mockMvc.perform(post("/api/volunteer/sign-in/oauth/{oauthProvider}", oauthProvider))
+                .andExpect(status().is3xxRedirection())
+                .andExpect(result -> {
+                    MockHttpServletResponse response = result.getResponse();
+                    String redirectedUrl = response.getRedirectedUrl();
+                    assertThat(redirectedUrl).isNotNull();
+                    assertThat(redirectedUrl).contains("oauth2/authorization/naver");
+                });
+    }
+
+    @Test
+    @DisplayName("지원되지 않는 OAuth 제공자로 로그인 시 400 에러를 반환한다.")
+    void signInWithInvalidProvider() throws Exception {
+        // Given
+        String invalidProvider = "unsupported-provider";
+
+        // When
+        // Then
+        mockMvc.perform(post("/api/volunteer/sign-in/oauth/{oauthProvider}", invalidProvider))
+                .andExpect(status().isBadRequest());
+    }
+
+    @Test
+    @DisplayName("로그아웃 요청 시 성공 메시지를 반환한다.")
+    void signOut() throws Exception {
+        // When
+        // Then
+        mockMvc.perform(post("/api/volunteer/sign-out"))
+                .andExpect(status().isOk())
+                .andExpect(result -> {
+                    MockHttpServletResponse response = result.getResponse();
+                    String responseBody = response.getContentAsString();
+                    assertThat(responseBody).contains("로그아웃되었습니다");
+                });
+    }
+}