I get the above error when deploying a trigger and its associated test class in production. I believe it has to do with either my creating a record that already exists via another trigger, or something that has been left null(?). Any and all help is much appreciated! Posting my trigger and test class below:

Trigger:

trigger closedTrigger on Opportunity (after update) {
    
    //create a list of related accounts and account Ids
    list<Id> acctIds = new list<Id>();
    list<Account> accts = new list<Account>();
    
    //get the accounts and oplineitems associated with the opportunity 
    for (opportunity o:trigger.new) {
        acctIds.add(o.accountId);    
    }
    
    //create a list of Opportunity Line Items 
   list<Id> prodOpIds = new list<Id>();
    
    Map<Id, Set<String>> mapProducts = new Map<Id, Set<String>>();
        for (opportunity op:trigger.new) {
            prodOpIds.add(op.Id);
            mapProducts.put(op.id, new Set<String>());
        }
    
    for (OpportunityLineItem z: [SELECT Id, Product2.Name, OpportunityId FROM OpportunityLineItem WHERE OpportunityId IN: prodOpIds]) {
        mapProducts.get(z.OpportunityId).add(z.Product2.Name);
    }
    
    //now we can loop over the associated account(s) and update the information with which we're concerned
    for (account a: [SELECT Id, Curriculum_Product__c, Past_Room_Scheduling_Product__c, Room_Scheduling_Product__c, 
                                                       Past_Curriculum_Product__c, Past_Event_Scheduling_Product__c, 
                                                       Event_Scheduler_Product__c,  Class_Schedule_Planning_Product__c, 
                                                       Past_Class_Scheduling_Product__c, Past_Catalog_Product__c, 
                                                       Catalog_Product__c, Account_Lifecycle_Status__c 
                     FROM account WHERE Id IN: acctIds]) {
        for (opportunity op:trigger.new) {
        Set<String> setProducts = mapProducts.get(op.Id);
            if (op.stageName=='Closed Won' && trigger.oldmap.get(op.Id).StageName != 'Closed Won') {
                //set status to Customer
                a.Account_Lifecycle_Status__c = 'Customer';
                //class 
                if(setProducts.contains('Class Scheduler') && a.Class_Schedule_Planning_Product__c != 'Coursedog')  {
                    a.Past_Class_Scheduling_Product__c = a.Class_Schedule_Planning_Product__c;
                    a.Class_Schedule_Planning_Product__c = 'Coursedog';                 
                } 
                //catalog
                if(setProducts.contains('Catalog Management') && a.Catalog_Product__c != 'Coursedog')  {
                    a.Past_Catalog_Product__c = a.Catalog_Product__c;
                    a.Catalog_Product__c = 'Coursedog';
                }
                //events
                if(setProducts.contains('Event Scheduler') && a.Event_Scheduler_Product__c != 'Coursedog')  {
                    a.Past_Event_Scheduling_Product__c = a.Event_Scheduler_Product__c;
                    a.Event_Scheduler_Product__c = 'Coursedog';
                }  
                //curriculum
                if(setProducts.contains('Curriculum Management') && a.Curriculum_Product__c != 'Coursedog')  {
                    a.Past_Curriculum_Product__c = a.Curriculum_Product__c;
                    a.Curriculum_Product__c = 'Coursedog';
                }
            accts.add(a);  
               
            }
            if (op.stageName=='Closed Lost' && trigger.oldmap.get(op.Id).StageName != 'Closed Lost') {
                a.Account_Lifecycle_Status__c = 'Recycled';
            accts.add(a);
            }
        }
    
    }
    update accts; 
}

Test class:

@istest
public class testClassForTrigger{
    @istest
    public static void triggerTest(){
        account acc = new account();
        acc.name='test'; //when you create an account you need a name 
        acc.Class_Schedule_Planning_Product__c = 'Astra Scheduler';
        acc.Curriculum_Product__c = 'Courseleaf CIM';
        acc.Catalog_Product__c = 'Courseleaf CAT';
        acc.Event_Scheduler_Product__c = 'EMS';
        insert acc; //now we have an ID
        
        Pricebook2 stdpb = new Pricebook2(Id = Test.getStandardPricebookId());
        update stdpb;

        Product2 p = new Product2(Name = 'Catalog Management', CanUseRevenueSchedule = true, IsActive = true);
        insert p;
        
        Product2 p2 = new Product2(Name = 'Curriculum Management', CanUseRevenueSchedule = true, IsActive = true);
        insert p2;
        
        Product2 p3 = new Product2(Name = 'Class Scheduler', CanUseRevenueSchedule = true, IsActive = true);
        insert p3;
        
        Product2 p4 = new Product2(Name = 'Event Scheduler', CanUseRevenueSchedule = true, IsActive = true);
        insert p4;

        PricebookEntry pbe = new PricebookEntry(Product2Id = p.Id, Pricebook2Id = stdpb.Id, IsActive = true, UnitPrice = 0);
        insert pbe;
        
        PricebookEntry pbe2 = new PricebookEntry(Product2Id = p2.Id, Pricebook2Id = stdpb.Id, IsActive = true, UnitPrice = 0);
        insert pbe2;
        
        PricebookEntry pbe3 = new PricebookEntry(Product2Id = p3.Id, Pricebook2Id = stdpb.Id, IsActive = true, UnitPrice = 0);
        insert pbe3;
        
        PricebookEntry pbe4 = new PricebookEntry(Product2Id = p4.Id, Pricebook2Id = stdpb.Id, IsActive = true, UnitPrice = 0);
        insert pbe4;
        
        opportunity opp = new opportunity();
        opp.name='test opp';
        opp.accountId = acc.Id; 
        opp.closedate = date.today().adddays(5);
        opp.stagename='Interest'; //when you create an op you need a stage, acocunt, name, and close date
        
        test.startTest();
        insert opp;
        
        
        OpportunityLineItem oli = new OpportunityLineItem(OpportunityId = opp.Id, PricebookEntryId = pbe.Id, Quantity = 1, UnitPrice = 50);
        insert oli;
        
        OpportunityLineItem oli2 = new OpportunityLineItem(OpportunityId = opp.Id, PricebookEntryId = pbe2.Id, Quantity = 1, UnitPrice = 50);
        insert oli2;
        
        OpportunityLineItem oli3 = new OpportunityLineItem(OpportunityId = opp.Id, PricebookEntryId = pbe3.Id, Quantity = 1, UnitPrice = 50);
        insert oli3;
        
        OpportunityLineItem oli4 = new OpportunityLineItem(OpportunityId = opp.Id, PricebookEntryId = pbe4.Id, Quantity = 1, UnitPrice = 50);
        insert oli4;
        
        opp.closedate = date.today();
        opp.stageName = 'Closed Won';
        update opp; 
        account actTest = [SELECT Id, Account_Lifecycle_Status__c, Class_Schedule_Planning_Product__c, Past_Class_Scheduling_Product__c, 
                                                                   Curriculum_Product__c, Past_Curriculum_Product__c,
                                                                   Catalog_Product__c, Past_Catalog_Product__c,
                                                                   Event_Scheduler_Product__c, Past_Event_Scheduling_Product__c
                                                                   FROM Account WHERE ID = :acc.Id LIMIT 1];
        update actTest; 
        system.assertequals('Customer', actTest.Account_Lifecycle_Status__c,'Opportunity update did not set account status properly');
        system.assertequals('Coursedog', actTest.Curriculum_Product__c, 'Opportunity did not set curriculum product properly');
        system.assertequals('Courseleaf CIM', actTest.Past_Curriculum_Product__c, 'Opportunity did not set curriculum product properly');
        system.assertequals('Coursedog', actTest.Class_Schedule_Planning_Product__c, 'Opportunity did not set scheduling product properly');
        system.assertequals('Astra Scheduler', actTest.Past_Class_Scheduling_Product__c, 'Opportunity did not set scheduling product properly');
        system.assertequals('Coursedog', actTest.Event_Scheduler_Product__c, 'Opportunity did not set event product properly');
        system.assertequals('EMS', actTest.Past_Event_Scheduling_Product__c, 'Opportunity did not set event product properly');
        system.assertequals('Coursedog', actTest.Catalog_Product__c, 'Opportunity did not set catlog product properly');
        system.assertequals('Courseleaf CAT', actTest.Past_Catalog_Product__c, 'Opportunity did not set catalog product properly');

        test.stopTest();
        
       
    }
}

 

I get the above error when deploying a trigger and its associated test class in production. I believe it has to do with either my creating a record that already exists via another trigger, or something that has been left null(?). Any and all help is much appreciated! Posting my trigger and test class below:

Trigger:

trigger closedTrigger on Opportunity (after update) {
    
    //create a list of related accounts and account Ids
    list<Id> acctIds = new list<Id>();
    list<Account> accts = new list<Account>();
    
    //get the accounts and oplineitems associated with the opportunity 
    for (opportunity o:trigger.new) {
        acctIds.add(o.accountId);    
    }
    
    //create a list of Opportunity Line Items 
   list<Id> prodOpIds = new list<Id>();
    
    Map<Id, Set<String>> mapProducts = new Map<Id, Set<String>>();
        for (opportunity op:trigger.new) {
            prodOpIds.add(op.Id);
            mapProducts.put(op.id, new Set<String>());
        }
    
    for (OpportunityLineItem z: [SELECT Id, Product2.Name, OpportunityId FROM OpportunityLineItem WHERE OpportunityId IN: prodOpIds]) {
        mapProducts.get(z.OpportunityId).add(z.Product2.Name);
    }
    
    //now we can loop over the associated account(s) and update the information with which we're concerned
    for (account a: [SELECT Id, Curriculum_Product__c, Past_Room_Scheduling_Product__c, Room_Scheduling_Product__c, 
                                                       Past_Curriculum_Product__c, Past_Event_Scheduling_Product__c, 
                                                       Event_Scheduler_Product__c,  Class_Schedule_Planning_Product__c, 
                                                       Past_Class_Scheduling_Product__c, Past_Catalog_Product__c, 
                                                       Catalog_Product__c, Account_Lifecycle_Status__c 
                     FROM account WHERE Id IN: acctIds]) {
        for (opportunity op:trigger.new) {
        Set<String> setProducts = mapProducts.get(op.Id);
            if (op.stageName=='Closed Won' && trigger.oldmap.get(op.Id).StageName != 'Closed Won') {
                //set status to Customer
                a.Account_Lifecycle_Status__c = 'Customer';
                //class 
                if(setProducts.contains('Class Scheduler') && a.Class_Schedule_Planning_Product__c != 'Coursedog')  {
                    a.Past_Class_Scheduling_Product__c = a.Class_Schedule_Planning_Product__c;
                    a.Class_Schedule_Planning_Product__c = 'Coursedog';                 
                } 
                //catalog
                if(setProducts.contains('Catalog Management') && a.Catalog_Product__c != 'Coursedog')  {
                    a.Past_Catalog_Product__c = a.Catalog_Product__c;
                    a.Catalog_Product__c = 'Coursedog';
                }
                //events
                if(setProducts.contains('Event Scheduler') && a.Event_Scheduler_Product__c != 'Coursedog')  {
                    a.Past_Event_Scheduling_Product__c = a.Event_Scheduler_Product__c;
                    a.Event_Scheduler_Product__c = 'Coursedog';
                }  
                //curriculum
                if(setProducts.contains('Curriculum Management') && a.Curriculum_Product__c != 'Coursedog')  {
                    a.Past_Curriculum_Product__c = a.Curriculum_Product__c;
                    a.Curriculum_Product__c = 'Coursedog';
                }
            accts.add(a);  
               
            }
            if (op.stageName=='Closed Lost' && trigger.oldmap.get(op.Id).StageName != 'Closed Lost') {
                a.Account_Lifecycle_Status__c = 'Recycled';
            accts.add(a);
            }
        }
    
    }
    update accts; 
}

Test class:

@istest
public class testClassForTrigger{
    @istest
    public static void triggerTest(){
        account acc = new account();
        acc.name='test'; //when you create an account you need a name 
        acc.Class_Schedule_Planning_Product__c = 'Astra Scheduler';
        acc.Curriculum_Product__c = 'Courseleaf CIM';
        acc.Catalog_Product__c = 'Courseleaf CAT';
        acc.Event_Scheduler_Product__c = 'EMS';
        insert acc; //now we have an ID
        
        Pricebook2 stdpb = new Pricebook2(Id = Test.getStandardPricebookId());
        update stdpb;

        Product2 p = new Product2(Name = 'Catalog Management', CanUseRevenueSchedule = true, IsActive = true);
        insert p;
        
        Product2 p2 = new Product2(Name = 'Curriculum Management', CanUseRevenueSchedule = true, IsActive = true);
        insert p2;
        
        Product2 p3 = new Product2(Name = 'Class Scheduler', CanUseRevenueSchedule = true, IsActive = true);
        insert p3;
        
        Product2 p4 = new Product2(Name = 'Event Scheduler', CanUseRevenueSchedule = true, IsActive = true);
        insert p4;

        PricebookEntry pbe = new PricebookEntry(Product2Id = p.Id, Pricebook2Id = stdpb.Id, IsActive = true, UnitPrice = 0);
        insert pbe;
        
        PricebookEntry pbe2 = new PricebookEntry(Product2Id = p2.Id, Pricebook2Id = stdpb.Id, IsActive = true, UnitPrice = 0);
        insert pbe2;
        
        PricebookEntry pbe3 = new PricebookEntry(Product2Id = p3.Id, Pricebook2Id = stdpb.Id, IsActive = true, UnitPrice = 0);
        insert pbe3;
        
        PricebookEntry pbe4 = new PricebookEntry(Product2Id = p4.Id, Pricebook2Id = stdpb.Id, IsActive = true, UnitPrice = 0);
        insert pbe4;
        
        opportunity opp = new opportunity();
        opp.name='test opp';
        opp.accountId = acc.Id; 
        opp.closedate = date.today().adddays(5);
        opp.stagename='Interest'; //when you create an op you need a stage, acocunt, name, and close date
        
        test.startTest();
        insert opp;
        
        
        OpportunityLineItem oli = new OpportunityLineItem(OpportunityId = opp.Id, PricebookEntryId = pbe.Id, Quantity = 1, UnitPrice = 50);
        insert oli;
        
        OpportunityLineItem oli2 = new OpportunityLineItem(OpportunityId = opp.Id, PricebookEntryId = pbe2.Id, Quantity = 1, UnitPrice = 50);
        insert oli2;
        
        OpportunityLineItem oli3 = new OpportunityLineItem(OpportunityId = opp.Id, PricebookEntryId = pbe3.Id, Quantity = 1, UnitPrice = 50);
        insert oli3;
        
        OpportunityLineItem oli4 = new OpportunityLineItem(OpportunityId = opp.Id, PricebookEntryId = pbe4.Id, Quantity = 1, UnitPrice = 50);
        insert oli4;
        
        opp.closedate = date.today();
        opp.stageName = 'Closed Won';
        update opp; 
        account actTest = [SELECT Id, Account_Lifecycle_Status__c, Class_Schedule_Planning_Product__c, Past_Class_Scheduling_Product__c, 
                                                                   Curriculum_Product__c, Past_Curriculum_Product__c,
                                                                   Catalog_Product__c, Past_Catalog_Product__c,
                                                                   Event_Scheduler_Product__c, Past_Event_Scheduling_Product__c
                                                                   FROM Account WHERE ID = :acc.Id LIMIT 1];
        update actTest; 
        system.assertequals('Customer', actTest.Account_Lifecycle_Status__c,'Opportunity update did not set account status properly');
        system.assertequals('Coursedog', actTest.Curriculum_Product__c, 'Opportunity did not set curriculum product properly');
        system.assertequals('Courseleaf CIM', actTest.Past_Curriculum_Product__c, 'Opportunity did not set curriculum product properly');
        system.assertequals('Coursedog', actTest.Class_Schedule_Planning_Product__c, 'Opportunity did not set scheduling product properly');
        system.assertequals('Astra Scheduler', actTest.Past_Class_Scheduling_Product__c, 'Opportunity did not set scheduling product properly');
        system.assertequals('Coursedog', actTest.Event_Scheduler_Product__c, 'Opportunity did not set event product properly');
        system.assertequals('EMS', actTest.Past_Event_Scheduling_Product__c, 'Opportunity did not set event product properly');
        system.assertequals('Coursedog', actTest.Catalog_Product__c, 'Opportunity did not set catlog product properly');
        system.assertequals('Courseleaf CAT', actTest.Past_Catalog_Product__c, 'Opportunity did not set catalog product properly');

        test.stopTest();
        
       
    }
}