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Somasundaram S 1Somasundaram S 1 

do i need to write test class

i am using the after insert,after update,after delete,after undelete events in my trigger while writing test class 
do i need to write for each event please advise
  
trigger quantityleft on Sample_Transaction__c (after insert,after update,after delete,after undelete) {
    List<Sample_Lot__c> list_lot= new List<Sample_Lot__c>();
    set<Id> set_Opportunity = new set<Id>();
     if(Trigger.isInsert || Trigger.isUndelete){
        for(Sample_Transaction__c objOpp: trigger.new){
        
        if(objOpp.Completed_Transaction__c == true){
         set_Opportunity.add(objOpp.Parent_id__c);
         //set_Opportunity.add(objOpp.id);
           }
    }
    }
    
    if(Trigger.isUpdate){
        for(Sample_Transaction__c objOpp: trigger.new){
        
        if(objOpp.Completed_Transaction__c == true){
        set_Opportunity.add(objOpp.Parent_id__c);
//        set_Opportunity.add(objOpp.id);
           }
  }
    
    
    }
    
    if(Trigger.isdelete){
        for(Sample_Transaction__c objOpp: trigger.old){
        
        if(objOpp.Completed_Transaction__c == true){
set_Opportunity.add(objOpp.Parent_id__c);
           }
  
    }
    
    }

    if(!set_Opportunity.isEmpty()){
    
    
    
                 Decimal Sum;
       Sum=0;

  for(Sample_Transaction__c sample_transaction : [SELECT id,Completed_Transaction__c,Sample_Lot_ID__c, Transaction_Quantity__c FROM Sample_Transaction__c WHERE Parent_id__c = : set_Opportunity

]){

           if(sample_transaction.Completed_Transaction__c ){
           system.debug('eeeeeeeeeeeeeeeeeeeeeeeeeeeee');
            Sum+= sample_transaction.Transaction_Quantity__c;
  
   }
  
    for(Sample_Lot__c objLot: [SELECT Id, Quantity_Left__c FROM Sample_Lot__c WHERE Id = : sample_transaction.Sample_Lot_ID__c]){

 

            objlot.Quantity_left__c = Sum ;

            list_lot.add(objlot);

 update objLot;

        }
        
 }
}

    
}


 
ManojjenaManojjena
Hi Somasundaram ,

Yes you need to create ,edit ,delete .undelete records in test method . Your code will give you code coverage for both insert and undelete . 
But incase if you have separate scope for undelete then you need to write test case for undelete .
As you have undelete event you should write test case for undelete .
Check below link for undelete event in test case .

https://developer.salesforce.com/forums/?id=906F000000090JXIAY

Thanks 
Manoj