Good day, i am new with SF development,a dn need to desperatelly create a class to test for this trigger.  This trigger essentially rolls up some values for opportunities that are attached to an account as a partner.  even if you guys can get me going I can keep up and work on the rest.

thanks,

trigger TotalOppVerifiedValue on Account (before update)
{
List<Opportunity> opplist=new List<Opportunity>();
List<Double> crr=new List<Double>();
 Double TotalAmt=0;
 for (Account acc:Trigger.new)
    {
  //   System.debug('######@@@@@@@@@'+acc);
  //List<Partner> prn=[Select Opportunityid from Partner where AccountfromId=:acc.id];
          for(Partner prn1:[Select Opportunityid from Partner where AccountfromId=:acc.id])
          {
          // System.debug('!!!!!@@@@@@@@@'+prn1);
          //  opplist.add(prn1. Opportunityid )
             for (Opportunity opp:[Select Verified_Value__c from Opportunity where id=:prn1.Opportunityid ])
             {
            
           //   System.debug('$$$$$$$$$$$$@@@@@@@@@'+opp);
               crr.add(opp.Verified_Value__c);
              
               // acc.Total_Verified_Value_for_Opps__c=opp.Verified_Value__c
             }
        //  System.debug('@@@@@@@@@'+crr);
         
          }
             for(integer i=0;i<crr.size();i++)
                {
                   TotalAmt += crr[i];
                }
        acc.Total_Verified_Value_for_Opps__c=TotalAmt ;
    }
  
  
  

}