I have writtened a test class for below class. But this is controller class. I am unable to cover code for  page reference method and all. please any one improve this code ?


public with sharing class SFDC_Class_Controller_Final{
  
    public list<SFDC_Enrollment__c> Enrolment { get; set; }
    public SFDC_Class__c cls{set;get;}

    public SFDC_Class_Controller_Final(ApexPages.StandardController controller) {
  
        this.cls = (SFDC_Class__c)controller.getRecord();
        if(this.cls.Id != null){
        Enrolment = [select Contact__c, Final_Exam__c, Final_Grade_Value__c, Class__r.Name,Class__r.id from SFDC_Enrollment__c where Class__r.id=:cls.id AND RecordType.Name like '%HLS HFS %'];
     
        }
    }
    public pagereference save(){
        try{
      
        upsert cls;
        upsert Enrolment;
       Pagereference p = new PageReference('/'+cls.Id);
         p.setRedirect(true);
          return p;  
     
        }
        catch(Exception e){}
        return null;
    }
     public pagereference clear(){

     for(SFDC_Enrollment__c enro:Enrolment ){
     enro.Final_Exam__c=null;
     enro.Final_Grade_Value__c=null;
     }
  
     return null;

    } 
}


Here is Test class  :

@isTest
public with sharing class SFDC_Class_Controller_Final_Test{

    static testMethod void  validatestudentdetails(){
    

    SFDC_Enrollment__c sccf=new SFDC_Enrollment__c();
    //sccf.Contact__c='kirthika@gmail.com';
        sccf.Final_Exam__c=100;
        sccf.Final_Grade_Value__c=100;
   insert sccf;
        SFDC_Class__c scc=new SFDC_Class__c();
        scc.name='testclass';
   insert scc;  

}

}