Fix: Product 객체 fixedPrice 계산 로직 수정

- 기존 연산 괄호 실수 -> 올바르게 변경
- 테스트 코드 추가

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

@@ -30,6 +30,6 @@ public Product(Long id, DiscountPolicy discountPolicy,
 	}
 
 	private long calculateFixedPrice() {
-		return (long) (originalPrice * (100 - discountPolicy.getDiscountRate() / 100));
+		return (long) (originalPrice * ((100 - discountPolicy.getDiscountRate()) / 100));
 	}
 }

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

@@ -41,7 +41,6 @@ void setUp() {
 	}
 
 
-	// 프로튼엔드가 특정 음식 타입 조회를 하게 해주세요
 	@Test
 	void 만약_meal_type이_soup인_경우_soup음식_타입_조회_성공() {
 		given()
@@ -57,7 +56,7 @@ void setUp() {
 			.body("[0].image", containsString("s3"))
 			.body("[0].productName", equalTo("한돈 돼지 김치찌개"))
 			.body("[0].description", equalTo("김치찌개에는 역시 돼지고기"))
-			.body("[0].fixedPrice", equalTo(8370))
+			.body("[0].fixedPrice", equalTo(7440))
 			.body("[0].originalPrice", equalTo(9300))
 			.body("[0].event", equalTo("이벤트특가"));
 	}

BE/src/test/java/sidedish/com/domain/ProductTest.java

@@ -0,0 +1,54 @@
+package sidedish.com.domain;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.List;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+@DisplayName("ProductTest 클래스")
+class ProductTest {
+
+
+	@Nested
+	@DisplayName("Product 생성자")
+	class Describe_constructor {
+
+	    @Nested
+	    @DisplayName("만약 이벤트특가 Discount Policy가 주어진다면")
+	    class Context_with_event_discount_policy {
+
+	        @Test
+	        @DisplayName("20% 할인된 Product를 생성한다.")
+	        void It_returns_a_Product() {
+				DiscountPolicy discountPolicy = new DiscountPolicy("이벤트특가", 20);
+				Image image = new Image("https://louie.com/test.jpg");
+
+				Product sut = new Product(1L, discountPolicy, List.of(image), "김치찌개", "맛있어요",
+					10000, "soup", "meat");
+
+				assertThat(sut.getDiscountPolicy().getPolicyName()).isEqualTo("이벤트특가");
+				assertThat(sut.getFixedPrice()).isEqualTo(8000);
+			}
+	    }
+
+		@Nested
+		@DisplayName("만약 런칭특가 Discount Policy가 주어진다면")
+		class Context_with_launching_discount_policy {
+
+			@Test
+			@DisplayName("10% 할인된 Product를 생성한다.")
+			void It_returns_a_Product() {
+				DiscountPolicy discountPolicy = new DiscountPolicy("런칭특가", 10);
+				Image image = new Image("https://louie.com/test.jpg");
+
+				Product sut = new Product(1L, discountPolicy, List.of(image), "김치찌개", "맛있어요",
+					10000, "soup", "meat");
+
+				assertThat(sut.getDiscountPolicy().getPolicyName()).isEqualTo("런칭특가");
+				assertThat(sut.getFixedPrice()).isEqualTo(9000);
+			}
+		}
+	}
+}