[BE] feat: 학교 목록 조회 기능 구현 (#431) (#432)

* feat: School 목록 조회 기능 구현

* feat: School 목록 조회 API 구현

* feat: Transactional(readonly=true) 적용

backend/src/main/java/com/festago/application/SchoolService.java

@@ -0,0 +1,22 @@
+package com.festago.application;
+
+import com.festago.domain.SchoolRepository;
+import com.festago.dto.SchoolsResponse;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@Transactional
+public class SchoolService {
+
+    private final SchoolRepository schoolRepository;
+
+    public SchoolService(SchoolRepository schoolRepository) {
+        this.schoolRepository = schoolRepository;
+    }
+
+    @Transactional(readOnly = true)
+    public SchoolsResponse findAll() {
+        return SchoolsResponse.from(schoolRepository.findAll());
+    }
+}

backend/src/main/java/com/festago/dto/SchoolResponse.java

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+package com.festago.dto;
+
+import com.festago.domain.School;
+
+public record SchoolResponse(
+    Long id,
+    String domain,
+    String name) {
+
+    public static SchoolResponse from(School school) {
+        return new SchoolResponse(
+            school.getId(),
+            school.getDomain(),
+            school.getName()
+        );
+    }
+}

backend/src/main/java/com/festago/dto/SchoolsResponse.java

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+package com.festago.dto;
+
+import static java.util.stream.Collectors.collectingAndThen;
+import static java.util.stream.Collectors.toList;
+
+import com.festago.domain.School;
+import java.util.List;
+
+public record SchoolsResponse(
+    List<SchoolResponse> schools) {
+
+    public static SchoolsResponse from(List<School> schools) {
+        return schools.stream()
+            .map(SchoolResponse::from)
+            .collect(collectingAndThen(toList(), SchoolsResponse::new));
+    }
+}

backend/src/main/java/com/festago/presentation/SchoolController.java

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+package com.festago.presentation;
+
+import com.festago.application.SchoolService;
+import com.festago.dto.SchoolsResponse;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/schools")
+public class SchoolController {
+
+    private final SchoolService schoolService;
+
+    public SchoolController(SchoolService schoolService) {
+        this.schoolService = schoolService;
+    }
+
+    @GetMapping
+    public ResponseEntity<SchoolsResponse> findAll() {
+        return ResponseEntity.ok(schoolService.findAll());
+    }
+}

backend/src/test/java/com/festago/presentation/SchoolControllerTest.java

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+package com.festago.presentation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.festago.application.SchoolService;
+import com.festago.dto.SchoolResponse;
+import com.festago.dto.SchoolsResponse;
+import com.festago.support.CustomWebMvcTest;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import org.junit.jupiter.api.DisplayNameGeneration;
+import org.junit.jupiter.api.DisplayNameGenerator.ReplaceUnderscores;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+
+@CustomWebMvcTest(SchoolController.class)
+@DisplayNameGeneration(ReplaceUnderscores.class)
+@SuppressWarnings("NonAsciiCharacters")
+class SchoolControllerTest {
+
+    @Autowired
+    MockMvc mockMvc;
+
+    @Autowired
+    ObjectMapper objectMapper;
+
+    @MockBean
+    SchoolService schoolService;
+
+    @Test
+    void 모든_학교_정보_조회() throws Exception {
+        // given
+        SchoolsResponse expected = new SchoolsResponse(
+            List.of(
+                new SchoolResponse(1L, "pooh.ac.kr", "푸우대학"),
+                new SchoolResponse(2L, "ash.ac.kr", "애쉬대학")
+            ));
+
+        given(schoolService.findAll())
+            .willReturn(expected);
+
+        // when & then
+        String content = mockMvc.perform(get("/schools")
+                .contentType(MediaType.APPLICATION_JSON))
+            .andExpect(status().isOk())
+            .andDo(print())
+            .andReturn()
+            .getResponse()
+            .getContentAsString(StandardCharsets.UTF_8);
+        SchoolsResponse actual = objectMapper.readValue(content, SchoolsResponse.class);
+        assertThat(actual).isEqualTo(expected);
+    }
+}