2단계 - 리팩터링(메뉴)

src/main/java/kitchenpos/menu/tobe/domain/vo/MenuProduct.java

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+package kitchenpos.menu.tobe.domain.vo;
+
+import java.util.UUID;
+import kitchenpos.common.price.Price;
+
+public class MenuProduct {
+
+    public final UUID productId;
+
+    public final Price pricePerUnit;
+
+    public final MenuProductQuantity quantity;
+
+    public MenuProduct(
+        final UUID productId,
+        final Price pricePerUnit,
+        final MenuProductQuantity quantity
+    ) {
+        this.productId = productId;
+        this.pricePerUnit = pricePerUnit;
+        this.quantity = quantity;
+    }
+
+    public Price subtotal() {
+        return this.pricePerUnit.multiply(this.quantity.value);
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        MenuProduct that = (MenuProduct) o;
+
+        if (!productId.equals(that.productId)) {
+            return false;
+        }
+        if (!pricePerUnit.equals(that.pricePerUnit)) {
+            return false;
+        }
+        return quantity.equals(that.quantity);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = productId.hashCode();
+        result = 31 * result + pricePerUnit.hashCode();
+        result = 31 * result + quantity.hashCode();
+        return result;
+    }
+}

src/test/java/kitchenpos/menu/Fixtures.java

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+package kitchenpos.menu;
+
+import java.util.Random;
+import java.util.UUID;
+import kitchenpos.common.name.NameFactory;
+import kitchenpos.common.price.Price;
+import kitchenpos.common.profanity.FakeProfanityDetectService;
+import kitchenpos.common.profanity.domain.ProfanityDetectService;
+import kitchenpos.menu.tobe.domain.entity.MenuGroup;
+import kitchenpos.menu.tobe.domain.vo.MenuProduct;
+import kitchenpos.menu.tobe.domain.vo.MenuProductQuantity;
+import kitchenpos.product.tobe.domain.entity.Product;
+
+public class Fixtures {
+
+    private static final ProfanityDetectService profanityDetectService = new FakeProfanityDetectService();
+
+    private static final NameFactory nameFactory = new NameFactory(profanityDetectService);
+
+    public static MenuGroup menuGroup() {
+        return menuGroup("두마리메뉴");
+    }
+
+    public static MenuGroup menuGroup(final String name) {
+        return new MenuGroup(UUID.randomUUID(), nameFactory.create(name));
+    }
+
+    public static MenuProduct menuProduct() {
+        return new MenuProduct(
+            UUID.randomUUID(),
+            new Price(10_000),
+            new MenuProductQuantity(new Random().nextInt(10))
+        );
+    }
+
+    public static MenuProduct menuProduct(final Product product, final long quantity) {
+        return new MenuProduct(
+            UUID.randomUUID(),
+            product.price(),
+            new MenuProductQuantity(quantity)
+        );
+    }
+}

src/test/java/kitchenpos/menu/tobe/domain/vo/MenuProductTest.java

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+package kitchenpos.menu.tobe.domain.vo;
+
+import static kitchenpos.menu.Fixtures.menuProduct;
+import static kitchenpos.product.Fixtures.product;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import kitchenpos.common.price.Price;
+import kitchenpos.product.tobe.domain.entity.Product;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class MenuProductTest {
+
+    @DisplayName("subtotal()")
+    @Nested
+    class Cvxueewc {
+
+        @DisplayName("소계가 올바르게 계산되어야 한다.")
+        @ValueSource(longs = {
+            16, 8, 32, 4, 1,
+            15, 13, 3, 31, 18,
+        })
+        @ParameterizedTest
+        void czxovwxu(final long quantity) {
+            final long pricePerUnit = 10000;
+            final Product product = product("상품", pricePerUnit);
+            final MenuProduct menuProduct = menuProduct(product, quantity);
+
+            assertThat(menuProduct.subtotal()).isEqualTo(new Price(pricePerUnit * quantity));
+        }
+    }
+}