�feat: 방장 위임 기능 구현 (#81)

* feat: 방장 위임 기능 구현

* test: 방장 위임 기능 테스트 작성

* test: 방장이 아닌 유저의 요청인 경우 추가

src/main/java/com/moabam/api/application/room/RoomService.java

@@ -63,10 +63,7 @@ public Long createRoom(Long memberId, CreateRoomRequest createRoomRequest) {
 	@Transactional
 	public void modifyRoom(Long memberId, Long roomId, ModifyRoomRequest modifyRoomRequest) {
 		Participant participant = getParticipant(memberId, roomId);
-
-		if (!participant.isManager()) {
-			throw new ForbiddenException(ROOM_MODIFY_UNAUTHORIZED_REQUEST);
-		}
+		validateManagerAuthorization(participant);
 
 		Room room = participant.getRoom();
 		room.changeTitle(modifyRoomRequest.title());
@@ -119,6 +116,16 @@ public void exitRoom(Long memberId, Long roomId) {
 		roomRepository.delete(room);
 	}
 
+	@Transactional
+	public void mandateRoomManager(Long managerId, Long roomId, Long memberId) {
+		Participant managerParticipant = getParticipant(managerId, roomId);
+		Participant memberParticipant = getParticipant(memberId, roomId);
+		validateManagerAuthorization(managerParticipant);
+
+		managerParticipant.disableManager();
+		memberParticipant.enableManager();
+	}
+
 	public void validateRoomById(Long roomId) {
 		if (!roomRepository.existsById(roomId)) {
 			throw new NotFoundException(ROOM_NOT_FOUND);
@@ -130,6 +137,12 @@ private Participant getParticipant(Long memberId, Long roomId) {
 			.orElseThrow(() -> new NotFoundException(PARTICIPANT_NOT_FOUND));
 	}
 
+	private void validateManagerAuthorization(Participant participant) {
+		if (!participant.isManager()) {
+			throw new ForbiddenException(ROOM_MODIFY_UNAUTHORIZED_REQUEST);
+		}
+	}
+
 	private void validateRoomEnter(Long memberId, String requestPassword, Room room) {
 		if (!isEnterRoomAvailable(memberId, room.getRoomType())) {
 			throw new BadRequestException(MEMBER_ROOM_EXCEED);

src/main/java/com/moabam/api/presentation/RoomController.java

@@ -71,4 +71,10 @@ public RoomDetailsResponse getRoomDetails(@PathVariable("roomId") Long roomId) {
 	public void certifyRoom(@PathVariable("roomId") Long roomId, @RequestPart List<MultipartFile> multipartFiles) {
 		roomCertificationService.certifyRoom(1L, roomId, multipartFiles);
 	}
+
+	@PutMapping("/{roomId}/members/{memberId}/mandate")
+	@ResponseStatus(HttpStatus.OK)
+	public void mandateManager(@PathVariable("roomId") Long roomId, @PathVariable("memberId") Long memberId) {
+		roomService.mandateRoomManager(1L, roomId, memberId);
+	}
 }

src/test/java/com/moabam/api/application/RoomServiceTest.java

@@ -6,6 +6,7 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -26,6 +27,8 @@
 import com.moabam.api.domain.room.repository.RoomRepository;
 import com.moabam.api.domain.room.repository.RoutineRepository;
 import com.moabam.api.dto.room.CreateRoomRequest;
+import com.moabam.global.error.exception.ForbiddenException;
+import com.moabam.support.fixture.RoomFixture;
 
 @ExtendWith(MockitoExtension.class)
 class RoomServiceTest {
@@ -97,4 +100,54 @@ void create_room_with_password_success() {
 		assertThat(result).isEqualTo(expectedRoom.getId());
 		assertThat(expectedRoom.getPassword()).isEqualTo("1234");
 	}
+
+	@DisplayName("방장 위임 성공")
+	@Test
+	void room_manager_mandate_success() {
+		// given
+		Long managerId = 1L;
+		Long memberId = 2L;
+
+		Room room = spy(RoomFixture.room());
+		given(room.getId()).willReturn(1L);
+
+		Participant memberParticipant = RoomFixture.participant(room, memberId);
+		Participant managerParticipant = RoomFixture.participant(room, managerId);
+		managerParticipant.enableManager();
+
+		given(participantSearchRepository.findOne(memberId, room.getId())).willReturn(
+			Optional.of(memberParticipant));
+		given(participantSearchRepository.findOne(managerId, room.getId())).willReturn(
+			Optional.of(managerParticipant));
+
+		// when
+		roomService.mandateRoomManager(managerId, room.getId(), memberId);
+
+		// then
+		assertThat(managerParticipant.isManager()).isFalse();
+		assertThat(memberParticipant.isManager()).isTrue();
+	}
+
+	@DisplayName("방장 위임 실패 - 방장이 아닌 유저가 요청할때")
+	@Test
+	void room_manager_mandate_fail() {
+		// given
+		Long managerId = 1L;
+		Long memberId = 2L;
+
+		Room room = spy(RoomFixture.room());
+		given(room.getId()).willReturn(1L);
+
+		Participant memberParticipant = RoomFixture.participant(room, memberId);
+		Participant managerParticipant = RoomFixture.participant(room, managerId);
+
+		given(participantSearchRepository.findOne(memberId, room.getId())).willReturn(
+			Optional.of(memberParticipant));
+		given(participantSearchRepository.findOne(managerId, room.getId())).willReturn(
+			Optional.of(managerParticipant));
+
+		// when, then
+		assertThatThrownBy(() -> roomService.mandateRoomManager(managerId, 1L, memberId))
+			.isInstanceOf(ForbiddenException.class);
+	}
 }