Feat: 특정 Products의 meal type 조회 기능의 서비스 구현

- 테스트 작성

BE/src/main/java/sidedish/com/repository/ProductsRepository.java

@@ -0,0 +1,11 @@
+package sidedish.com.repository;
+
+import java.util.List;
+import org.springframework.stereotype.Repository;
+import sidedish.com.domain.Product;
+
+@Repository
+public interface ProductsRepository {
+
+	List<Product> findByMealType(String meal);
+}

BE/src/main/java/sidedish/com/service/ProductsService.java

@@ -3,11 +3,18 @@
 import java.util.List;
 import org.springframework.stereotype.Service;
 import sidedish.com.domain.Product;
+import sidedish.com.repository.ProductsRepository;
 
 @Service
 public class ProductsService {
 
+	ProductsRepository productsRepository;
+
+	public ProductsService(ProductsRepository productsRepository) {
+		this.productsRepository = productsRepository;
+	}
+
 	public List<Product> findByMealType(String meal) {
-		return null;
+		return productsRepository.findByMealType(meal);
 	}
 }

BE/src/test/java/sidedish/com/service/ProductsServiceTest.java

@@ -0,0 +1,49 @@
+package sidedish.com.service;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+
+import java.util.ArrayList;
+import java.util.List;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import sidedish.com.domain.DisCountPolicy;
+import sidedish.com.domain.Image;
+import sidedish.com.domain.Product;
+import sidedish.com.repository.ProductsRepository;
+
+@DisplayName("ProductsServiceTest 클래스")
+class ProductsServiceTest {
+
+	private ProductsService productsService;
+	private ProductsRepository productsRepository;
+
+	@BeforeEach
+	void setUp() {
+		productsRepository = mock(ProductsRepository.class);
+		productsService = new ProductsService(productsRepository);
+	}
+
+	@Test
+	void 만약_meal_type이_soup인_경우_soup음식_타입_조회_성공() throws Exception {
+		given(productsRepository.findByMealType("soup"))
+			.willReturn(createListProducts());
+
+		List<Product> result = productsService.findByMealType("soup");
+
+		assertThat(result.size()).isEqualTo(2);
+	}
+
+	private List<Product> createListProducts() {
+		List<Product> products = new ArrayList<>();
+
+		products.add(new Product(5L, List.of(new Image("http://kukukukukukukukuku.com/test.jpg")),
+			"한돈 돼지 김치찌개", "김치찌개에는 역시 돼지고기", 8370, 9300, new DisCountPolicy("이벤트특가")));
+		products.add(new Product(6L, List.of(new Image("http://kukukukukukukukuku.com/test2.jpg")),
+			"하하하 테스트 음식", "맛있어요", 8370, 9300, new DisCountPolicy("이벤트특가")));
+
+		return products;
+	}
+}