[Order API TDD] 상품 조회 기능 구현하기

product-order-service/README.md

@@ -23,6 +23,8 @@ final AddProductRequest request = new AddProductRequest(name, price, discountPol
 (5) 레파지포리 생성
 - 테스트에서는 데이터를 인메모리(Map)로 관리
 
+> Then -> Given -> When 순서로 적성해 보기
+
 .
 
 **Move Inner class for test to Upper level**
@@ -42,6 +44,13 @@ API 테스트를 위해 io.rest-assured:rest-assured 사용하기
   - 데이터가 캐싱이 되어 table sequence 가 꼬여 다른 테스트가 깨질 수 있음(ex. table sequence)
   - 격리 방법은 [3월 우아한테크세미나 / 우아한ATDD](https://www.youtube.com/watch?v=ITVpmjM4mUE) 참고
 
+## JPA 적용하기
+
+기존 in-memory 형태의 데이터 저장소를 jpa 로 적용
+
+## 상품 조회 기능 구현하기
+
+상품 등록 구현으로 이미 기반이 잡혀 있으므로 POJO 부터 테스트를 시작하지 않고 @SpringBootTest 로 시작
 
 ---
 
@@ -51,6 +60,9 @@ Point.
 - Assert in constructor
 - rest-assured api test
 - var type
+- HttpStatus
+  - 200 OK
+  - 201 CREATE
 
 ---
 

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

@@ -0,0 +1,17 @@
+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

@@ -4,6 +4,7 @@
 
 @Component
 class ProductAdapter implements ProductPort {
+
     private final ProductRepository productRepository;
 
     ProductAdapter(final ProductRepository productRepository) {
@@ -14,4 +15,10 @@ class ProductAdapter implements ProductPort {
     public void save(final Product product) {
         productRepository.save(product);
     }
+
+    @Override
+    public Product getProduct(final 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 @@
 
 interface ProductPort {
     void save(final Product product);
+
+    Product getProduct(long productId);
 }

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

@@ -26,4 +26,14 @@ public ResponseEntity<Void> addProduct(@RequestBody final AddProductRequest requ
 
         return ResponseEntity.status(HttpStatus.CREATED).build();
     }
+
+    public GetProductResponse getProduct(final 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

@@ -1,40 +1,19 @@
 package com.example.productorderservice.product;
 
-import io.restassured.RestAssured;
-import io.restassured.response.ExtractableResponse;
-import io.restassured.response.Response;
 import org.junit.jupiter.api.Test;
 import org.springframework.http.HttpStatus;
-import org.springframework.http.MediaType;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
 class ProductApiTest extends ApiTest {
 
     @Test
     void 상품등록() {
-        final var request = getAddProductRequest();
+        final var request = ProductSteps.getAddProductRequest();
 
-        final var response = requestAddProduct(request);
+        final var response = ProductSteps.requestAddProduct(request);
 
         assertThat(response.statusCode()).isEqualTo(HttpStatus.CREATED.value());
     }
 
-    private ExtractableResponse<Response> requestAddProduct(final AddProductRequest request) {
-        return RestAssured.given().log().all() // 요청 로그 남기기
-                .contentType(MediaType.APPLICATION_JSON_VALUE)
-                .body(request)
-                .when()
-                .post("/products")
-                .then()
-                .log().all().extract();
-    }
-
-    private AddProductRequest getAddProductRequest() {
-        final String name = "상품명";
-        final int price = 1000;
-        final DiscountPolicy discountPolicy = DiscountPolicy.NONE;
-        return new AddProductRequest(name, price, discountPolicy); // 02. Request 클래스 생성
-    }
-
 }

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

@@ -0,0 +1,28 @@
+package com.example.productorderservice.product;
+
+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.AssertionsForClassTypes.assertThat;
+
+@SpringBootTest
+class ProductServiceTest {
+
+    @Autowired
+    private ProductService productService;
+
+    @Test
+    void 상품조회() {
+        // 상품 등록
+        productService.addProduct(ProductSteps.getAddProductRequest());
+        final long productId = 1L;
+
+        // 상품 조회
+        final GetProductResponse response = productService.getProduct(productId);
+
+        // 상품의 응답 검증
+        assertThat(response).isNotNull();
+    }
+
+}

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

@@ -0,0 +1,25 @@
+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> requestAddProduct(final AddProductRequest request) {
+        return RestAssured.given().log().all() // 요청 로그 남기기
+                .contentType(MediaType.APPLICATION_JSON_VALUE)
+                .body(request)
+                .when()
+                .post("/products")
+                .then()
+                .log().all().extract();
+    }
+
+    public static AddProductRequest getAddProductRequest() {
+        final String name = "상품명";
+        final int price = 1000;
+        final DiscountPolicy discountPolicy = DiscountPolicy.NONE;
+        return new AddProductRequest(name, price, discountPolicy); // 02. Request 클래스 생성
+    }
+}