상품을 등록할 때 가격을 음수로 지정할 수 없게 한다

README.md

@@ -306,6 +306,7 @@
 - [x] 판매자가 아닌 사용자의 접근 토큰을 사용하면 403 Forbidden 상태코드를 반환한다
 - [x] imageUri 속성이 URI 형식을 따르지 않으면 400 Bad Request 상태코드를 반환한다
 - [x] 올바르게 요청하면 등록된 상품 정보에 접근하는 Location 헤더를 반환한다
+- [x] priceAmount 속성이 0보다 작으면 400 Bad Request 상태코드를 반환한다
 
 ### 판매자 상품 조회
 

src/main/java/commerce/commandmodel/RegisterProductCommandExecutor.java

@@ -1,5 +1,6 @@
 package commerce.commandmodel;
 
+import java.math.BigDecimal;
 import java.net.URI;
 import java.time.LocalDateTime;
 import java.util.UUID;
@@ -29,7 +30,7 @@ public void execute(
     }
 
     private static void validateCommand(RegisterProductCommand command) {
-        if (isValidUri(command.imageUri()) == false) {
+        if (command.priceAmount().compareTo(BigDecimal.ZERO) < 0) {
             throw new InvalidCommandException();
         }
     }

src/test/java/test/commerce/RegisterProductCommandGenerator.java

@@ -30,6 +30,18 @@ public static RegisterProductCommand generateRegisterProductCommandWithImageUri(
         );
     }
 
+    public static RegisterProductCommand generateRegisterProductCommandWithPriceAmount(
+        BigDecimal priceAmount
+    ) {
+        return new RegisterProductCommand(
+            generateProductName(),
+            generateProductImageUri(),
+            generateProductDescription(),
+            priceAmount,
+            generateProductStockQuantity()
+        );
+    }
+
     private static String generateProductName() {
         return "name" + UUID.randomUUID();
     }

src/test/java/test/commerce/api/seller/products/POST_specs.java

@@ -1,5 +1,6 @@
 package test.commerce.api.seller.products;
 
+import java.math.BigDecimal;
 import java.net.URI;
 import java.util.UUID;
 import java.util.function.Predicate;
@@ -16,6 +17,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static test.commerce.RegisterProductCommandGenerator.generateRegisterProductCommand;
 import static test.commerce.RegisterProductCommandGenerator.generateRegisterProductCommandWithImageUri;
+import static test.commerce.RegisterProductCommandGenerator.generateRegisterProductCommandWithPriceAmount;
 
 @CommerceApiTest
 @DisplayName("POST /seller/products")
@@ -116,4 +118,25 @@ private Predicate<? super String> endsWithUUID() {
             }
         };
     }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { -1, -0.1 })
+    void priceAmount_속성이_0보다_작으면_400_Bad_Request_상태코드를_반환한다(
+        double priceAmountValue,
+        @Autowired TestFixture fixture
+    ) {
+        // Arrange
+        fixture.createSellerThenSetAsDefaultUser();
+        BigDecimal priceAmount = new BigDecimal(priceAmountValue);
+
+        // Act
+        ResponseEntity<Void> response = fixture.client().postForEntity(
+            "/seller/products",
+            generateRegisterProductCommandWithPriceAmount(priceAmount),
+            Void.class
+        );
+
+        // Assert
+        assertThat(response.getStatusCode().value()).isEqualTo(400);
+    }
 }