Hi Team,


1. Write a test class for Rollup Summary Trigger , must cover 100% code coverage?
2. Without writing Test class shall we deploy the Trigger from Sandbox to Produntion. Explain?

Trigger Code :
 

trigger RolllupSummaryOppAmt on Opportunity (After insert, After update,After delete, After undelete) {
    if(checkRecursive.runOnce()){
    Set<Id> accid = new Set<Id>();
    Decimal avgamt;
    Decimal sumamt;
        Integer noopp;
    if(Trigger.isInsert || Trigger.isUpdate || Trigger.isUndelete){
        for(Opportunity opp : Trigger.New){
            if(opp.AccountId != null){
                accid.add(opp.AccountId);
            }
            
        }
    }
    
    if(Trigger.isDelete || Trigger.isUpdate){
        for(Opportunity op : Trigger.Old){
            if(op.AccountId != null){
                accid.add(op.AccountId);
            }
            
        }
    }
        
    List<Account> aclist = [select id,OppAvgAmount__c,SumOfOppAmt__c,NoOfOpp__c,(select id,amount from opportunities) from account where id In :accid];
    List<Account> upacc = new List<Account>();
    if(aclist.size()>0){
        for(Account ac : aclist){
           
            List<AggregateResult> aglist = [select count(id)t,avg(amount)agg,min(amount)sumamt from opportunity where accountid = :ac.id];
            for(AggregateResult ag : aglist){
                avgamt = (Decimal)ag.get('agg');
                sumamt = (Decimal)ag.get('sumamt');
                noopp = (Integer)ag.get('t');
                system.debug('---average---:'+avgamt);
            }
            ac.OppAvgAmount__c = avgamt;
            ac.SumOfOppAmt__c = sumamt;
            ac.NoOfOpp__c = noopp;
            upacc.add(ac);
        }
        
            update upacc;
       
    }

    }
}

Thanks
Lakshmi.