BAEL-2275: Change constructor of Order

ddd/src/test/java/com/baeldung/ddd/layers/domain/OrderProvider.java

@@ -3,11 +3,10 @@ package com.baeldung.ddd.layers.domain;
 import org.bson.types.ObjectId;
 
 import java.math.BigDecimal;
-import java.util.Arrays;
 
 public class OrderProvider {
     public static Order getCreatedOrder() {
-        return new Order(ObjectId.get(), Arrays.asList(new Product(BigDecimal.TEN, "productName")));
+        return new Order(ObjectId.get(), new Product(BigDecimal.TEN, "productName"));
     }
 
     public static Order getCompletedOrder() {

ddd/src/test/java/com/baeldung/ddd/layers/domain/service/DomainOrderServiceUnitTest.java

@@ -10,7 +10,6 @@ import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.function.Executable;
 
 import java.math.BigDecimal;
-import java.util.Arrays;
 import java.util.Optional;
 
 import static org.junit.jupiter.api.Assertions.assertNotNull;
@@ -33,7 +32,7 @@ class DomainOrderServiceUnitTest {
     void shouldCreateOrder_thenSaveIt() {
         final Product product = new Product(BigDecimal.TEN, "productName");
 
-        final ObjectId id = tested.createOrder(Arrays.asList(product));
+        final ObjectId id = tested.createOrder(product);
 
         verify(orderRepository).save(any(Order.class));
         assertNotNull(id);

ddd/src/test/java/com/baeldung/ddd/layers/infrastracture/repository/MongoDbOrderRepositoryUnitTest.java

@@ -14,7 +14,7 @@ class MongoDbOrderRepositoryUnitTest {
     void setUp(){
 
     }
-    
+
     @Test
     void findById() {
     }