feat: 아이템 적용 기능 구현

src/main/java/com/moabam/api/application/ItemService.java

@@ -1,16 +1,20 @@
 package com.moabam.api.application;
 
+import static com.moabam.global.error.model.ErrorMessage.*;
+
 import java.util.List;
 
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import com.moabam.api.domain.entity.Inventory;
 import com.moabam.api.domain.entity.Item;
 import com.moabam.api.domain.entity.enums.ItemType;
 import com.moabam.api.domain.repository.InventorySearchRepository;
 import com.moabam.api.domain.repository.ItemSearchRepository;
 import com.moabam.api.dto.ItemMapper;
 import com.moabam.api.dto.ItemsResponse;
+import com.moabam.global.error.exception.NotFoundException;
 
 import lombok.RequiredArgsConstructor;
 
@@ -28,4 +32,18 @@ public ItemsResponse getItems(Long memberId, ItemType type) {
 
 		return ItemMapper.toItemsResponse(purchasedItems, notPurchasedItems);
 	}
+
+	@Transactional
+	public void selectItem(Long memberId, Long itemId) {
+		Inventory inventory = getInventory(memberId, itemId);
+
+		inventorySearchRepository.findDefault(memberId, inventory.getItemType())
+			.ifPresent(Inventory::unsetDefault);
+		inventory.setDefault();
+	}
+
+	private Inventory getInventory(Long memberId, Long itemId) {
+		return inventorySearchRepository.findOne(memberId, itemId)
+			.orElseThrow(() -> new NotFoundException(INVENTORY_NOT_FOUND));
+	}
 }

src/main/java/com/moabam/api/domain/entity/Inventory.java

@@ -4,6 +4,7 @@
 
 import org.hibernate.annotations.ColumnDefault;
 
+import com.moabam.api.domain.entity.enums.ItemType;
 import com.moabam.global.common.entity.BaseTimeEntity;
 
 import jakarta.persistence.Column;
@@ -49,4 +50,16 @@ private Inventory(Long memberId, Item item, boolean isDefault) {
 		this.item = requireNonNull(item);
 		this.isDefault = isDefault;
 	}
+
+	public ItemType getItemType() {
+		return this.item.getType();
+	}
+
+	public void setDefault() {
+		this.isDefault = true;
+	}
+
+	public void unsetDefault() {
+		this.isDefault = false;
+	}
 }

src/main/java/com/moabam/api/domain/repository/InventorySearchRepository.java

@@ -4,9 +4,11 @@
 import static com.moabam.api.domain.entity.QItem.*;
 
 import java.util.List;
+import java.util.Optional;
 
 import org.springframework.stereotype.Repository;
 
+import com.moabam.api.domain.entity.Inventory;
 import com.moabam.api.domain.entity.Item;
 import com.moabam.api.domain.entity.enums.ItemType;
 import com.moabam.global.common.util.DynamicQuery;
@@ -20,6 +22,27 @@ public class InventorySearchRepository {
 
 	private final JPAQueryFactory jpaQueryFactory;
 
+	public Optional<Inventory> findOne(Long memberId, Long itemId) {
+		return Optional.ofNullable(
+			jpaQueryFactory.selectFrom(inventory)
+				.where(
+					DynamicQuery.generateEq(memberId, inventory.memberId::eq),
+					DynamicQuery.generateEq(itemId, inventory.item.id::eq))
+				.fetchOne()
+		);
+	}
+
+	public Optional<Inventory> findDefault(Long memberId, ItemType type) {
+		return Optional.ofNullable(
+			jpaQueryFactory.selectFrom(inventory)
+				.where(
+					DynamicQuery.generateEq(memberId, inventory.memberId::eq),
+					DynamicQuery.generateEq(type, inventory.item.type::eq),
+					inventory.isDefault.isTrue())
+				.fetchOne()
+		);
+	}
+
 	public List<Item> findItems(Long memberId, ItemType type) {
 		return jpaQueryFactory.selectFrom(inventory)
 			.join(inventory.item, item)

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

@@ -2,6 +2,8 @@
 
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseStatus;
@@ -25,4 +27,10 @@ public class ItemController {
 	public ItemsResponse getItems(@RequestParam ItemType type) {
 		return itemService.getItems(1L, type);
 	}
+
+	@PostMapping("/{itemId}/select")
+	@ResponseStatus(HttpStatus.OK)
+	public void selectItem(@PathVariable Long itemId) {
+		itemService.selectItem(1L, itemId);
+	}
 }

src/main/java/com/moabam/global/error/model/ErrorMessage.java

@@ -28,6 +28,8 @@ public enum ErrorMessage {
 	MEMBER_NOT_FOUND("존재하지 않는 회원입니다."),
 	MEMBER_ROOM_EXCEED("참여할 수 있는 방의 개수가 모두 찼습니다."),
 
+	INVENTORY_NOT_FOUND("구매하지 않은 아이템은 적용할 수 없습니다."),
+
 	INVALID_BUG_COUNT("벌레 개수는 0 이상이어야 합니다."),
 	INVALID_PRICE("가격은 0 이상이어야 합니다."),
 	INVALID_QUANTITY("수량은 1 이상이어야 합니다."),

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

@@ -26,10 +26,10 @@
 import com.moabam.api.dto.AuthorizationTokenRequest;
 import com.moabam.api.dto.AuthorizationTokenResponse;
 import com.moabam.api.dto.OAuthMapper;
-import com.moabam.fixture.AuthorizationResponseFixture;
 import com.moabam.global.config.OAuthConfig;
 import com.moabam.global.error.exception.BadRequestException;
 import com.moabam.global.error.model.ErrorMessage;
+import com.moabam.support.fixture.AuthorizationResponseFixture;
 
 @ExtendWith(MockitoExtension.class)
 class AuthenticationServiceTest {

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

@@ -1,5 +1,6 @@
 package com.moabam.api.application;
 
+import static com.moabam.support.fixture.MemberFixture.*;
 import static org.assertj.core.api.Assertions.*;
 import static org.mockito.BDDMockito.*;
 
@@ -13,7 +14,6 @@
 import com.moabam.api.domain.entity.Bug;
 import com.moabam.api.domain.entity.Member;
 import com.moabam.api.dto.BugResponse;
-import com.moabam.fixture.MemberFixture;
 
 @ExtendWith(MockitoExtension.class)
 class BugServiceTest {
@@ -29,7 +29,7 @@ class BugServiceTest {
 	void get_bug_success() {
 		// given
 		Long memberId = 1L;
-		Member member = MemberFixture.member();
+		Member member = member();
 		given(memberService.getById(memberId)).willReturn(member);
 
 		// when

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

@@ -1,26 +1,32 @@
 package com.moabam.api.application;
 
-import static com.moabam.fixture.ItemFixture.*;
+import static com.moabam.support.fixture.ItemFixture.*;
 import static java.util.Collections.*;
 import static org.assertj.core.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.*;
 import static org.mockito.BDDMockito.*;
 
 import java.util.List;
+import java.util.Optional;
 
 import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
 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 com.moabam.api.domain.entity.Inventory;
 import com.moabam.api.domain.entity.Item;
 import com.moabam.api.domain.entity.enums.ItemType;
 import com.moabam.api.domain.repository.InventorySearchRepository;
 import com.moabam.api.domain.repository.ItemSearchRepository;
 import com.moabam.api.dto.ItemResponse;
 import com.moabam.api.dto.ItemsResponse;
 import com.moabam.global.common.util.StreamUtils;
+import com.moabam.global.error.exception.NotFoundException;
+import com.moabam.support.fixture.InventoryFixture;
 
 @ExtendWith(MockitoExtension.class)
 class ItemServiceTest {
@@ -54,4 +60,45 @@ void get_products_success() {
 		assertThat(purchasedItemNames).containsExactly(MORNING_SANTA_SKIN_NAME, MORNING_KILLER_SKIN_NAME);
 		assertThat(response.notPurchasedItems()).isEmpty();
 	}
+
+	@DisplayName("아이템을 적용한다.")
+	@Nested
+	class SelectItem {
+
+		@DisplayName("성공한다.")
+		@Test
+		void success() {
+			// given
+			Long memberId = 1L;
+			Long itemId = 1L;
+			Inventory inventory = InventoryFixture.inventory(memberId, nightMageSkin());
+			Inventory defaultInventory = InventoryFixture.inventory(memberId, nightMageSkin());
+			ItemType itemType = inventory.getItemType();
+			when(inventorySearchRepository.findOne(memberId, itemId)).thenReturn(Optional.of(inventory));
+			when(inventorySearchRepository.findDefault(memberId, itemType)).thenReturn(Optional.of(defaultInventory));
+
+			// when
+			itemService.selectItem(memberId, itemId);
+
+			// then
+			verify(inventorySearchRepository).findOne(memberId, itemId);
+			verify(inventorySearchRepository).findDefault(memberId, itemType);
+			assertFalse(defaultInventory.isDefault());
+			assertTrue(inventory.isDefault());
+		}
+
+		@DisplayName("인벤토리 아이템이 아니면 예외가 발생한다.")
+		@Test
+		void exception() {
+			// given
+			Long memberId = 1L;
+			Long itemId = 1L;
+			when(inventorySearchRepository.findOne(memberId, itemId)).thenReturn(Optional.empty());
+
+			// when, then
+			assertThatThrownBy(() -> itemService.selectItem(memberId, itemId))
+				.isInstanceOf(NotFoundException.class)
+				.hasMessage("구매하지 않은 아이템은 적용할 수 없습니다.");
+		}
+	}
 }

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

@@ -1,6 +1,6 @@
 package com.moabam.api.application;
 
-import static com.moabam.fixture.ProductFixture.*;
+import static com.moabam.support.fixture.ProductFixture.*;
 import static org.assertj.core.api.Assertions.*;
 import static org.mockito.BDDMockito.*;
 

src/test/java/com/moabam/api/domain/entity/MemberTest.java

@@ -8,8 +8,8 @@
 import org.junit.jupiter.api.Test;
 
 import com.moabam.api.domain.entity.enums.Role;
-import com.moabam.fixture.MemberFixture;
 import com.moabam.global.common.util.BaseImageUrl;
+import com.moabam.support.fixture.MemberFixture;
 
 class MemberTest {