Feat: 주문 실패 시 현재 재고 수량을 반환해주도록 GlobalExceptionHandler 구현

- 인수 테스트 작성

BE/src/main/java/sidedish/com/controller/OrderController.java

@@ -20,7 +20,9 @@ public class OrderController {
 
     @PostMapping("/api/products/{id}/order")
     @ResponseStatus(HttpStatus.CREATED)
-    public OrderSaveResponse order(@PathVariable Long id, @RequestBody @Valid OrderSaveRequest orderSaveRequest) {
+    public OrderSaveResponse order(@PathVariable Long id,
+        @RequestBody @Valid OrderSaveRequest orderSaveRequest) {
         return orderService.save(id, orderSaveRequest.getCount());
     }
+
 }

BE/src/main/java/sidedish/com/domain/Product.java

@@ -27,7 +27,7 @@ public Product(Long id, DiscountPolicy discountPolicy,
 		String description, long originalPrice, long stockQuantity, String mealCategory,
 		String bestCategory) {
 		if (stockQuantity < 0) {
-			throw new NotEnoughStockQuantityException("재고가 충분하지 않습니다");
+			throw new NotEnoughStockQuantityException(stockQuantity);
 		}
 		this.id = id;
 		this.discountPolicy = discountPolicy;
@@ -53,7 +53,7 @@ private long calculateFixedPrice() {
 
 	public void minusStockQuantity(long count) {
 		if (count > stockQuantity) {
-			throw new NotEnoughStockQuantityException("재고가 충분하지 않습니다");
+			throw new NotEnoughStockQuantityException(stockQuantity);
 		}
 		stockQuantity -= count;
 	}

BE/src/main/java/sidedish/com/exception/GlobalExceptionHandler.java

@@ -0,0 +1,24 @@
+package sidedish.com.exception;
+
+import java.util.Collections;
+import java.util.Map;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+	@ResponseStatus(HttpStatus.BAD_REQUEST)
+	@ExceptionHandler(NotEnoughStockQuantityException.class)
+	public Map<String, Long> exceptionHandler(NotEnoughStockQuantityException e) {
+		long stockQuantity = e.getStockQuantity();
+		return Collections.singletonMap("currentStockQuantity", stockQuantity);
+	}
+
+	@ResponseStatus(value = HttpStatus.NOT_FOUND)
+	@ExceptionHandler(NoSuchProductsException.class)
+	public void exceptionHandler(NoSuchProductsException e) {
+	}
+}

BE/src/main/java/sidedish/com/exception/NoSuchProductsException.java

@@ -3,7 +3,6 @@
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.ResponseStatus;
 
-@ResponseStatus(value = HttpStatus.NOT_FOUND)
 public class NoSuchProductsException extends RuntimeException {
 
 }

BE/src/main/java/sidedish/com/exception/NotEnoughStockQuantityException.java

@@ -1,12 +1,12 @@
 package sidedish.com.exception;
 
-import org.springframework.http.HttpStatus;
-import org.springframework.web.bind.annotation.ResponseStatus;
+import lombok.Getter;
 
-@ResponseStatus(HttpStatus.BAD_REQUEST)
+@Getter
 public class NotEnoughStockQuantityException extends RuntimeException {
+    private long stockQuantity;
 
-    public NotEnoughStockQuantityException(String message) {
-        super(message);
+    public NotEnoughStockQuantityException(long stockQuantity) {
+        this.stockQuantity = stockQuantity;
     }
 }

BE/src/test/java/sidedish/com/acceptancetest/OrderAcceptanceTest.java

@@ -0,0 +1,68 @@
+package sidedish.com.acceptancetest;
+
+import static io.restassured.RestAssured.given;
+import static org.hamcrest.Matchers.equalTo;
+
+import io.restassured.RestAssured;
+import net.minidev.json.JSONObject;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.jdbc.Sql;
+
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
+@Sql({"/testdb/schema.sql", "/testdb/data.sql"})
+@DisplayName("Order 인수테스트")
+class OrderAcceptanceTest {
+
+	@LocalServerPort
+	int port;
+
+	@BeforeEach
+	void setUp() {
+		RestAssured.port = port;
+	}
+
+	@Test
+	void 재고가_충분할_경우_특정_상품_주문_성공() {
+		JSONObject requestBody = new JSONObject();
+		requestBody.put("count", "10");
+
+		given()
+			.accept(MediaType.APPLICATION_JSON_VALUE)
+			.header("Content-type", "application/json")
+			.body(requestBody)
+
+		.when()
+			.post("/api/products/1/order")
+
+		.then()
+			.statusCode(HttpStatus.CREATED.value())
+			.assertThat()
+			.body("id", equalTo(1));
+	}
+
+	@Test
+	void 재고가_충분하지_않을_경우_특정_상품_주문_실패() {
+		JSONObject requestBody = new JSONObject();
+		requestBody.put("count", 1000);
+
+		given()
+			.accept(MediaType.APPLICATION_JSON_VALUE)
+			.header("Content-type", "application/json")
+			.body(requestBody)
+
+		.when()
+			.post("/api/products/1/order")
+
+		.then()
+			.statusCode(HttpStatus.BAD_REQUEST.value())
+			.assertThat()
+			.body("currentStockQuantity", equalTo(100));
+	}
+}

BE/src/test/resources/testdb/schema.sql

@@ -1,3 +1,4 @@
+drop table if exists orders;
 drop table if exists product_image;
 drop table if exists product;
 drop table if exists discount_policy;
@@ -40,3 +41,13 @@ create table product_image
     image_url  varchar(1000) not null,
     foreign key (product_id) references product (id)
 );
+
+create table orders
+(
+    id              bigint          auto_increment primary key,
+    product_id      bigint          not null,
+    total_price     bigint          not null,
+    count           bigint          not null,
+    delivery_price  bigint          not null,
+    foreign key (product_id) references product (id)
+);