I wrote and deployed a Test for using a VF page for product line entry.  My Test class worked previously.  Now I am getting a System.Assert Exception error for virtually the same code.  I only added additional required fields for the Opportunity Line Item.  Can anyone help?

Here is the test Class:

@istest (SeeAllData=true)
private class opportunityProductEntryTests {

    static testMethod void theTests(){
       
        // You really should create test data, but I'm going to query instead
        // It's my best shot of avoiding a test failure in most orgs
        // Once you've installed this package though, you might want to write your own tests
        // or at least customize these ones to make them more applicable to your org
           
        OpportunityLineItem oli = [select Id, PricebookEntryId, PricebookEntry.Pricebook2Id, PricebookEntry.Name, PriceBookEntry.Product2Id, OpportunityId, Opportunity.AccountId from OpportunityLineItem limit 1];
              
               
        ////////////////////////////////////////
        //  test opportunityProductEntry
        ////////////////////////////////////////
       
        // load the page      
        PageReference pageRef = Page.opportunityProductEntry;
        pageRef.getParameters().put('Id',oli.OpportunityId);
        system.Test.setCurrentPageReference(pageRef);
       
        // load the extension
        opportunityProductEntryExtension oPEE = new opportunityProductEntryExtension(new ApexPages.StandardController(oli.Opportunity));
       
        // test 'getChosenCurrency' method
        if(UserInfo.isMultiCurrencyOrganization())
            System.assert(oPEE.getChosenCurrency()!='');
        else
            System.assertEquals(oPEE.getChosenCurrency(),'');

        // we know that there is at least one line item, so we confirm
        Integer startCount = oPEE.ShoppingCart.size();
        system.assert(startCount>0);

        //test search functionality without finding anything
        oPEE.searchString = 'michaelforce is a hip cat';
        oPEE.updateAvailableList();
        system.assert(oPEE.AvailableProducts.size()==0);
       
        //test remove from shopping cart
        oPEE.toUnselect = oli.PricebookEntryId;
        oPEE.removeFromShoppingCart();
        system.assert(oPEE.shoppingCart.size()==startCount-1);
       
        //test save and reload extension
        oPEE.onSave();
        oPEE = new opportunityProductEntryExtension(new ApexPages.StandardController(oli.Opportunity));
        system.assert(oPEE.shoppingCart.size()==startCount-1);
       
        // test search again, this time we will find something
        oPEE.searchString = oli.PricebookEntry.Name;
        oPEE.updateAvailableList();
        system.assert(oPEE.AvailableProducts.size()>0);      

        // test add to Shopping Cart function
        oPEE.toSelect = oPEE.AvailableProducts[0].Id;
        oPEE.addToShoppingCart();
        system.assert(oPEE.shoppingCart.size()==startCount);
               
        // test save method - WITHOUT quanitities and amounts entered and confirm that error message is displayed
        oPEE.onSave();
        system.assert(ApexPages.getMessages().size()>0);
       
        // add required info and try save again
        for(OpportunityLineItem o : oPEE.ShoppingCart){
            o.quantity = 5;
            o.unitprice = 300;
            o.Term_Months__c = 12;
            o.Term_on_Product__c = FALSE;
            o.Opportunity_Type__c = 'New Business';
        }
        oPEE.onSave();
       
        // query line items to confirm that the save worked **HERE IS WHERE THE ERROR OCCURS**
        opportunityLineItem[] oli2 = [select Id from opportunityLineItem where OpportunityId = :oli.OpportunityId];
        system.assert(oli2.size()==startCount);
       
        // test on new Opp (no pricebook selected) to make sure redirect is happening
        Opportunity newOpp = new Opportunity(Name='New Opp',stageName='Pipeline',Amount=10,closeDate=System.Today()+30,AccountId=oli.Opportunity.AccountId);
        insert(newOpp);
        oPEE = new opportunityProductEntryExtension(new ApexPages.StandardController(newOpp));
        System.assert(oPEE.priceBookCheck()!=null);
       
        // final quick check of cancel button
        System.assert(oPEE.onCancel()!=null);
       
       
        ////////////////////////////////////////
        //  test redirect page
        ////////////////////////////////////////
       
        // load the page
        pageRef = Page.opportunityProductRedirect;
        pageRef.getParameters().put('Id',oli2[0].Id);
        system.Test.setCurrentPageReference(pageRef);

        // load the extension and confirm that redirect function returns something
        opportunityProductRedirectExtension oPRE = new opportunityProductRedirectExtension(new ApexPages.StandardController(oli2[0]));
        System.assert(oPRE.redirect()!=null);
    
    }

}

I wrote and deployed a Test for using a VF page for product line entry.  My Test class worked previously.  Now I am getting a System.Assert Exception error for virtually the same code.  I only added additional required fields for the Opportunity Line Item.  Can anyone help?

Here is the test Class:

@istest (SeeAllData=true)
private class opportunityProductEntryTests {

    static testMethod void theTests(){
       
        // You really should create test data, but I'm going to query instead
        // It's my best shot of avoiding a test failure in most orgs
        // Once you've installed this package though, you might want to write your own tests
        // or at least customize these ones to make them more applicable to your org
           
        OpportunityLineItem oli = [select Id, PricebookEntryId, PricebookEntry.Pricebook2Id, PricebookEntry.Name, PriceBookEntry.Product2Id, OpportunityId, Opportunity.AccountId from OpportunityLineItem limit 1];
              
               
        ////////////////////////////////////////
        //  test opportunityProductEntry
        ////////////////////////////////////////
       
        // load the page      
        PageReference pageRef = Page.opportunityProductEntry;
        pageRef.getParameters().put('Id',oli.OpportunityId);
        system.Test.setCurrentPageReference(pageRef);
       
        // load the extension
        opportunityProductEntryExtension oPEE = new opportunityProductEntryExtension(new ApexPages.StandardController(oli.Opportunity));
       
        // test 'getChosenCurrency' method
        if(UserInfo.isMultiCurrencyOrganization())
            System.assert(oPEE.getChosenCurrency()!='');
        else
            System.assertEquals(oPEE.getChosenCurrency(),'');

        // we know that there is at least one line item, so we confirm
        Integer startCount = oPEE.ShoppingCart.size();
        system.assert(startCount>0);

        //test search functionality without finding anything
        oPEE.searchString = 'michaelforce is a hip cat';
        oPEE.updateAvailableList();
        system.assert(oPEE.AvailableProducts.size()==0);
       
        //test remove from shopping cart
        oPEE.toUnselect = oli.PricebookEntryId;
        oPEE.removeFromShoppingCart();
        system.assert(oPEE.shoppingCart.size()==startCount-1);
       
        //test save and reload extension
        oPEE.onSave();
        oPEE = new opportunityProductEntryExtension(new ApexPages.StandardController(oli.Opportunity));
        system.assert(oPEE.shoppingCart.size()==startCount-1);
       
        // test search again, this time we will find something
        oPEE.searchString = oli.PricebookEntry.Name;
        oPEE.updateAvailableList();
        system.assert(oPEE.AvailableProducts.size()>0);      

        // test add to Shopping Cart function
        oPEE.toSelect = oPEE.AvailableProducts[0].Id;
        oPEE.addToShoppingCart();
        system.assert(oPEE.shoppingCart.size()==startCount);
               
        // test save method - WITHOUT quanitities and amounts entered and confirm that error message is displayed
        oPEE.onSave();
        system.assert(ApexPages.getMessages().size()>0);
       
        // add required info and try save again
        for(OpportunityLineItem o : oPEE.ShoppingCart){
            o.quantity = 5;
            o.unitprice = 300;
            o.Term_Months__c = 12;
            o.Term_on_Product__c = FALSE;
            o.Opportunity_Type__c = 'New Business';
        }
        oPEE.onSave();
       
        // query line items to confirm that the save worked **HERE IS WHERE THE ERROR OCCURS**
        opportunityLineItem[] oli2 = [select Id from opportunityLineItem where OpportunityId = :oli.OpportunityId];
        system.assert(oli2.size()==startCount);
       
        // test on new Opp (no pricebook selected) to make sure redirect is happening
        Opportunity newOpp = new Opportunity(Name='New Opp',stageName='Pipeline',Amount=10,closeDate=System.Today()+30,AccountId=oli.Opportunity.AccountId);
        insert(newOpp);
        oPEE = new opportunityProductEntryExtension(new ApexPages.StandardController(newOpp));
        System.assert(oPEE.priceBookCheck()!=null);
       
        // final quick check of cancel button
        System.assert(oPEE.onCancel()!=null);
       
       
        ////////////////////////////////////////
        //  test redirect page
        ////////////////////////////////////////
       
        // load the page
        pageRef = Page.opportunityProductRedirect;
        pageRef.getParameters().put('Id',oli2[0].Id);
        system.Test.setCurrentPageReference(pageRef);

        // load the extension and confirm that redirect function returns something
        opportunityProductRedirectExtension oPRE = new opportunityProductRedirectExtension(new ApexPages.StandardController(oli2[0]));
        System.assert(oPRE.redirect()!=null);
    
    }

}

I did try the query in Force.com Explore and get the result whoever when I ran the test this error comes up.  Please help!!!
Here is my code:

@istest
private class QuoteProductEntryTests {

    static testMethod void theTests(){
      
          
        QuoteLineItem qli = [select Id, PricebookEntryId, PriceBookEntry.Product2Id, QuoteId, Quote.OpportunityId from QuoteLineItem limit 1];
             
              
        ////////////////////////////////////////
        //  test QuoteProductEntry
        ////////////////////////////////////////
      
        // load the page     
        PageReference pageRef = Page.QuoteProductEntry;
        pageRef.getParameters().put('Id',qli.QuoteId);
        Test.setCurrentPageReference(pageRef);
      
        // load the extension
        QuoteitemExtension oPEE = new QuoteItemExtension(new ApexPages.StandardController(qli.Quote));
      
        // test 'getChosenCurrency' method
        if(UserInfo.isMultiCurrencyOrganization())
            System.assert(oPEE.getChosenCurrency()!='');
        else
            System.assertEquals(oPEE.getChosenCurrency(),'');

        // we know that there is at least one line item, so we confirm
        Integer startCount = oPEE.ShoppingCart.size();
        system.assert(startCount>0);

        //test search functionality without finding anything
        oPEE.searchString = 'michaelforce is a hip cat';
        oPEE.updateAvailableList();
        system.assert(oPEE.AvailableProducts.size()==0);
      
        //test remove from shopping cart
        oPEE.toUnselect = qli.PricebookEntryId;
        oPEE.removeFromShoppingCart();
        system.assert(oPEE.shoppingCart.size()==startCount-1);
      
        //test save and reload extension
        oPEE.onSave();
        oPEE = new QuoteItemExtension(new ApexPages.StandardController(qli.Quote));
        system.assert(oPEE.shoppingCart.size()==startCount-1);
      
        // test search again, this time we will find something
        oPEE.searchString = qli.PricebookEntry.Name;
        oPEE.updateAvailableList();
        system.assert(oPEE.AvailableProducts.size()>0);     

        // test add to Shopping Cart function
        oPEE.toSelect = oPEE.AvailableProducts[0].Id;
        oPEE.addToShoppingCart();
        system.assert(oPEE.shoppingCart.size()==startCount);
              
        // test save method - WITHOUT quanitities and amounts entered and confirm that error message is displayed
        oPEE.onSave();
        system.assert(ApexPages.getMessages().size()>0);
      
        // add required info and try save again
        for(QuoteLineItem o : oPEE.ShoppingCart){
            o.quantity = 5;
            o.unitprice = 300;
        }
        oPEE.onSave();
      
        // query line items to confirm that the save worked
        QuoteLineItem[] qli2 = [select Id from QuoteLineItem where QuoteId = :qli.QuoteId];
        system.assert(qli2.size()==startCount);
      
        // test on new Opp (no pricebook selected) to make sure redirect is happening
        Quote newQuote = new Quote(Name='New quote', OpportunityId=qli.Quote.OpportunityId);
        insert(newQuote);
        oPEE = new QuoteItemExtension(new ApexPages.StandardController(newQuote));
        System.assert(oPEE.priceBookCheck()!=null);
      
        // final quick check of cancel button
        System.assert(oPEE.onCancel()!=null);
      
      
        ////////////////////////////////////////
        //  test redirect page
        ////////////////////////////////////////
      
        // load the page

   
    }
}