Hi there,

I wrote a a trigger to add a product to the opportunity, it works fine but I'm stuck at the test class which is giving me low code coverage, I need help with the test class. Please see the trigger/test class below, thanks in advance.

trigger AddOppLines on Opportunity (after update,after insert) 
{
    List<OpportunityLineItem> OppLineItems = new List<OpportunityLineItem>();
    for (Opportunity newOpp: Trigger.New) 
    {
            
            Integer C110013 = 1;
            
            for(PriceBookEntry a : [SELECT Id, ProductCode FROM PriceBookEntry WHERE PriceBook2.Name='Bulk TV 1'])
            {
                if (a.ProductCode == '110013' && C110013 > 0)
                {
                    OppLineItems.add(new OpportunityLineItem(OpportunityId = newOpp.Id,PricebookEntryId = a.Id,Quantity = C110013, UnitPrice = 0,Auto__c = TRUE));
                }
            }   
    }
    insert OppLineItems;
}


---------------------------------------------------------------------------------------------------------------------------------------------------------------


@isTest 
private class AddOppLinesTestClass 
{
    static testMethod void validateAddOppLines() 
    {
    
        PriceBook2 pb = new PriceBook2(Name='Bulk TV 1',IsActive=true);
        insert pb;
        
        Product2 p = new Product2(Name='TrigTest',IsActive=TRUE,ProductCode='110013',Description='TriggerTest');
        insert p;
        
        PricebookEntry pbe = new PricebookEntry(Product2Id = p.Id,PriceBook2Id = pb.Id,IsActive = true,UnitPrice = 20.00);
        
        Opportunity b = new Opportunity(Name='Test 1',StageName='New',CloseDate=Date.today());
        insert b;
    }
}