public class AddCostCenterController 
{
	Id targetid;
    public List<Cost_Center__c> cst {set;get;}
    public integer rno {set;get;}
    
    public AddCostCenterController(ApexPages.StandardController controller)
    {
        targetid =Apexpages.currentPage().getparameters().get('targetid');
        cst = new List<Cost_Center__c>();
        Cost_Center__c ct= new Cost_Center__c();
        ct.Target__c = targetid;
        cst.add(ct);
    }
    public pageReference save(){
        insert cst;
        pageReference ct = new PageReference('/'+targetid);
        return ct;
    
    }
    public void addRow()
    {
        cst.add(new Cost_Center__c(Target__c = targetid ));
        
    }
    public void delRow(){
        rno = integer.valueOf(Apexpages.currentPage().getParameters().get('index'));
        cst.remove(rno);
    }
}

@isTest
private class Ctr_AddCostCenters_Test
{
  static testMethod void Ctr_AddCostCenters(){
    test.startTest();
    
    
    
     Goal__c goal_Obj = new Goal__c(Name='Test',Flag__c = false,Financial_Year__c='2018-2019');
    Insert goal_Obj; 
      
    Cost_Center__c cost_center_Obj = new Cost_Center__c(Target__c = goal_Obj.id);
    Insert cost_center_Obj; 
    
    PageReference pageRef = Page.AddcostCenters;
    pageRef.getParameters().put('cost_center_Obj','test');
    pageRef.getParameters().put('index','test');
    Test.setCurrentPage(pageRef);
   ApexPages.StandardController sc = new ApexPages.StandardController(cost_center_Obj);
   AddCostCenterController obj01 = new AddCostCenterController(sc);  
   obj01.addRow();
   obj01.save();
   obj01.delRow();
    
    
              
      
  }
 
}