#33 tdd(order-service): get product

product-order-service/src/main/java/com/example/productorderservice/product/GetProductResponse.java

@@ -0,0 +1,18 @@
+package com.example.productorderservice.product;
+
+import org.springframework.util.Assert;
+
+record GetProductResponse(
+        long id,
+        String name,
+        int price,
+        DiscountPolicy discountPolicy
+) {
+
+    GetProductResponse {
+        Assert.notNull(id, "상품 ID는 필수입니다.");
+        Assert.hasText(name, "상품명은 필수입니다.");
+        Assert.isTrue(price > 0, "상품 가격은 0보다 커야 합니다.");
+        Assert.notNull(discountPolicy, "할인 정책은 필수입니다.");
+    }
+}

product-order-service/src/main/java/com/example/productorderservice/product/ProductAdapter.java

@@ -15,4 +15,10 @@ class ProductAdapter implements ProductPort {
     public void save(Product product) {
         productRepository.save(product);
     }
+
+    @Override
+    public Product getProduct(long productId) {
+        return productRepository.findById(productId)
+                .orElseThrow(() -> new IllegalArgumentException("상품이 존재하지 않습니다."));
+    }
 }

product-order-service/src/main/java/com/example/productorderservice/product/ProductPort.java

@@ -2,4 +2,6 @@ package com.example.productorderservice.product;
 
 interface ProductPort {
     void save(Product product);
+
+    Product getProduct(long productId);
 }

product-order-service/src/main/java/com/example/productorderservice/product/ProductService.java

@@ -18,4 +18,15 @@ class ProductService {
 
         productPort.save(product);
     }
+
+    public GetProductResponse getProduct(long productId) {
+        final Product product = productPort.getProduct(productId);
+
+        return new GetProductResponse(
+                product.getId(),
+                product.getName(),
+                product.getPrice(),
+                product.getDiscountPolicy()
+        );
+    }
 }

product-order-service/src/test/java/com/example/productorderservice/product/ProductApiTest.java

@@ -15,20 +15,12 @@ class ProductApiTest extends ApiTest {
     @Test
     void 상품등록() {
         final var request = 상품등록요청_생성();
-        final var response = 상품등록요청(request);
+        final var response = ProductSteps.상품등록요청(request);
 
         assertThat(response.statusCode()).isEqualTo(HttpStatus.CREATED.value());
     }
 
-    private static ExtractableResponse<Response> 상품등록요청(AddProductRequest request) {
-        return RestAssured.given().log().all()
-                .contentType(MediaType.APPLICATION_JSON_VALUE)
-                .body(request)
-                .when()
-                .post("/products")
-                .then()
-                .log().all().extract();
-    }
+
 
     private static AddProductRequest 상품등록요청_생성() {
         final String name = "상품명";

product-order-service/src/test/java/com/example/productorderservice/product/ProductServiceTest.java

@@ -1,10 +1,11 @@
 package com.example.productorderservice.product;
 
-import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 
+import static org.assertj.core.api.Assertions.*;
+
 @SpringBootTest
 class ProductServiceTest {
 
@@ -13,18 +14,22 @@ class ProductServiceTest {
 
     @Test
     void 상품등록() {
-        final AddProductRequest request = 상품등록요청_생성();
+        final AddProductRequest request = ProductSteps.상품등록요청_생성();
 
         productService.addProduct(request);
     }
 
-    private static AddProductRequest 상품등록요청_생성() {
-        final String name = "상품명";
-        final int price = 1000;
-        final DiscountPolicy discountPolicy = DiscountPolicy.NONE;
+    @Test
+    void 상품조회() {
+        // 상품등록
+        productService.addProduct(ProductSteps.상품등록요청_생성());
+        final long productId = 1L;
 
-        final AddProductRequest request = new AddProductRequest(name, price, discountPolicy);
-        return request;
+        // 상품 조회
+        final GetProductResponse response = productService.getProduct(productId);
+
+        // 상품의 응답을 검증
+        assertThat(response).isNotNull();
     }
 
 }

product-order-service/src/test/java/com/example/productorderservice/product/ProductSteps.java

@@ -0,0 +1,28 @@
+package com.example.productorderservice.product;
+
+import io.restassured.RestAssured;
+import io.restassured.response.ExtractableResponse;
+import io.restassured.response.Response;
+import org.springframework.http.MediaType;
+
+public class ProductSteps {
+
+    public static ExtractableResponse<Response> 상품등록요청(AddProductRequest request) {
+        return RestAssured.given().log().all()
+                .contentType(MediaType.APPLICATION_JSON_VALUE)
+                .body(request)
+                .when()
+                .post("/products")
+                .then()
+                .log().all().extract();
+    }
+
+    public static AddProductRequest 상품등록요청_생성() {
+        final String name = "상품명";
+        final int price = 1000;
+        final DiscountPolicy discountPolicy = DiscountPolicy.NONE;
+
+        final AddProductRequest request = new AddProductRequest(name, price, discountPolicy);
+        return request;
+    }
+}