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// Helper Class
public class Helper_trigger_acc {
    public static void insertAcc(List<Account> listaAccount){      
        id owner = userinfo.getUserId();
         AggregateResult[] CountAccount =[select count(id) contatore, ownerid from account where ownerid !=:owner group by ownerid order by count(id)];
       	 list <account> acc_app = [select id, ownerid from account where ownerid=: owner];
        for(Account acc: listaAccount)
        {
          
            if(acc_app.size()>=20)
            
                acc.ownerid = (ID)CountAccount[0].get('ownerid');  //CHANGE OWNER
              else
            	acc_app.add(acc);
            
        }
    }
  }




//Classe di test

@istest
private class Classe_TestHelperTrigger {
    @istest
    static void m1()
    {
        String uniqueUserName = 'standarduser' + DateTime.now().getTime() + '@testorg.com';
		list<Account> acc = new list<Account>();      
        Profile p = [SELECT Id FROM Profile WHERE Name='Standard User'];
        User u = new User(Alias = 'standt', Email='standarduser@testorg.com',
        EmailEncodingKey='UTF-8', LastName='Testing', LanguageLocaleKey='en_US',
        LocaleSidKey='en_US', ProfileId = p.Id,
        TimeZoneSidKey='America/Los_Angeles',
         UserName=uniqueUserName);
        for(integer i=0;i<25;i++)
        {
            acc.add(new Account(name='Account '+i));
        }
        system.runAs(u){
            account a1 = new Account(name ='Utente fittizio'); 
            insert a1;
        }
       
        test.startTest();
        insert acc;
        Helper_trigger_acc.insertAcc(acc);
        test.stopTest();
         AggregateResult[] CountAccount = [select count(id) contatore, ownerid from account group by ownerid order by count(id)];
        system.debug(CountAccount);
        
    }

}