Hello,
While solving challenge 8 I am getting an error:- 
Challenge Not yet complete... here's what's wrong: 
Ensure that orderTrigger and orderHelper are still working as specified in the earlier challenge.
Please let me know what I am doing wrong else paste the correct code here.
My code goes as follows-:

CLASS- OrderTests

@isTest
public class OrderTests {
    @testSetup 
    public static void SetupTestData() {     
            TestDataFactory.InsertTestData(3);      
    }
    
   @isTest
    public static void OrderUpdate_UnitTest (){
        Test.startTest();
        
        List<Product2> originalProduct=[Select Quantity_Ordered__c from Product2 where Name like 'ProductConstruction%'];
        
        List<Order> ord=new List<Order>();
        List<Order> testOrders=[Select status from Order where status='Draft'];
        System.debug('originalPro '+originalProduct);
        System.debug('Ordertest orders '+testOrders);
        
        for(Order o:testOrders){
            
            o.Status=Constants.ACTIVATED_ORDER_STATUS;
            ord.add(o);
        }
        System.debug('OrderTests 21 '+ord);
        update ord;
        List<Product2> updatedProduct=OrderHelper.pr; 
        //System.debug(updatedProduct.get(0)+' '+originalProduct.get(0));
           TestDataFactory.VerifyQuantityOrdered(originalProduct.get(0), updatedProduct.get(0), (Integer)OrderHelper.temp.get(0)); 
        Test.stopTest();
    }
    @isTest
    public static void OrderExtension_UnitTest (){
        Test.startTest();
        
        Account ac=new Account();
        ac.Name='Test1';
        insert ac;
        
        Contract ct=new Contract();
        ct.AccountId=ac.Id;
        ct.StartDate =date.today();
        ct.Status='Draft';
        ct.ContractTerm=4; 
        insert ct;
        
        Order obj=new Order();
        obj.AccountId=ac.Id;
        obj.EffectiveDate=date.today();
        obj.ContractId=ct.Id;
        obj.Status='Draft';
        obj.Name='OrderName';
       
        insert obj;
        
        ApexPages.StandardController sc = new ApexPages.StandardController(obj);
        
        OrderExtension cc=new OrderExtension(sc);
        cc.SelectFamily();
        cc.OnFieldChange();
        cc.Save();
        cc.First();
        cc.Next();
        cc.Previous();
        cc.Last();
        cc.GetHasPrevious();
        cc.GetHasNext();
        cc.GetTotalPages();
        cc.GetFamilyOptions();
        Test.stopTest();
    }
}

CLASS- prouct2Tests
@isTest (seeAllData=true)
private class Product2Tests {

    /**
     * @name product2Extension_UnitTest
     * @description UnitTest for product2Extension
    **/ 
    static TestMethod void Product2Extension_UnitTest(){
        Test.startTest();
           PageReference pageRef = Page.Product2New;
           Test.setCurrentPage(pageRef);
          
        
        ApexPages.StandardController controller =new Apexpages.StandardController(new Product2());
            Product2Extension ext = new Product2Extension(controller);
            ext.addRows();
            ext.save();
            System.assertEquals(Product2Extension.productsToInsert.size(), Constants.DEFAULT_ROWS);
        
         
         //if(addValue.equals('Add'))
                  //System.assertEquals(Product2Extension.productsToInsert.size(), 2*Constants.DEFAULT_ROWS);
        
        Integer i=0;
        for(Product2Extension.ProductWrapper pr: Product2Extension.productsToInsert){
            if (String.isBlank(pr.productRecord.Name) || pr.productRecord.Name==null){
                pr.productRecord.Name='Product'+i;
            }
               
            if(String.isBlank(pr.productRecord.Family) ||  pr.productRecord.Family==null ){
                pr.productRecord.Family='Side';
            }
                  
            if(pr.productRecord.IsActive==false){
                pr.productRecord.IsActive=true;
            }
            if(pr.productRecord.Initial_Inventory__c==null){
                pr.productRecord.Initial_Inventory__c=15;
            }
            i++;
                   
        }
        PageReference p=ext.save();
        List<Product2> queryResults=[Select Name,IsActive,Initial_Inventory__c from Product2 where Initial_Inventory__c=15 and IsActive= true and Family='Side'];
                Test.stopTest();
        System.assertEquals(queryResults.size(), 5);
        System.debug(Product2Extension.productsToInsert.size());       

    }
    static void Product2Trigger_UnitTest(){
        Test.startTest();
        
        Product2 p=new Product2();
        p.Name='TestProduct';
        p.Family='Side';
        p.IsActive=true;
        p.Quantity_Ordered__c =100;
        p.Initial_Inventory__c =10;
        insert p;
        
        p.Quantity_Ordered__c=200;
        update p;
            
        Test.stopTest();
    }

}

CLASS - OrderHelper
public without sharing class OrderHelper {

    /**
     * @name AfterUpdate
     * @description 
     * @param List<Order> newList
     * @param List<Order> oldList
     * @return void
    **/
    public static List<Product2> pr=new List<Product2>();
    public static List<Decimal> temp;
    public static void AfterUpdate(List<Order> newList, List<Order> oldList){
        Set<Id> orderIds = new Set<Id>();
        for ( Integer i=0; i<newList.size(); i++ ){
            if ( newList[i].Status == Constants.ACTIVATED_ORDER_STATUS && oldList[i].Status == Constants.DRAFT_ORDER_STATUS ){
                orderIds.add(newList[i].Id);
            }
        }
        System.debug('New Order '+newList);
        System.debug('Old Order '+oldList);
        System.debug('OrderIDS '+orderIds);
        OrderHelper.RollUpOrderItems(orderIds);
    }

    /**
     * @name RollUpOrderItems
     * @description Given a set of Activated Order ids, query the child Order Items and related Products to calculate Inventory levels
     * @param Set<Id> activatedOrderIds
     * @return void
    **/
    public static void RollUpOrderItems(Set<Id> activatedOrderIds){
        List<OrderItem> oi=[Select Id, Product2Id ,AvailableQuantity from OrderItem where OrderId IN:activatedOrderIds];
        Map<Id,Product2> productMap=new Map<Id,Product2>();
        //ToDo: Declare a Map named "productMap" of Ids to Product2 records

        //ToDo: Loop through a query of OrderItems related to the activatedOrderIds
        for(OrderItem ord:oi){
            Product2 p=[Select Id,Name, Quantity_Ordered__c , Quantity_Remaining__c from Product2 where Id=: ord.Product2Id ];
            productMap.put(ord.Product2Id, p);
         }
         
        
          AggregateResult[] groupedResults =[Select Product2Id,SUM(Quantity) from OrderItem where Product2Id IN : productMap.keySet() group by Product2Id];
        
        for(AggregateResult ag:groupedResults){
             Product2 p= productmap.get((Id)ag.get('Product2Id'));
               p.Quantity_Ordered__c =(Double)ag.get('expr0');
                temp.add(p.Quantity_Ordered__c);
               pr.add(p);
        }
        System.debug('orderHelper'+pr+' '+activatedOrderIds+' '+groupedResults);
        update pr;
            //ToDo: Populate the map with the Id of the related Product2 as the key and Product2 record as the value
            
        //ToDo: Loop through a query that aggregates the OrderItems related to the Products in the ProductMap keyset

        //ToDo: Perform an update on the records in the productMap
    }

}

Thanks in advance
Shubham Nandwana