Dear Pals,

This is the question on including System.Assert statements on existing test class which has 93% code coverage for Apex controller class

Here is the test class,need your help in writing system.debug statments in the below class
 

@isTest
public class ERT_MultiLevelSelectEditTest {
    
  @testSetup static void setup() {
        
    Case_Type_Data__c ct = new Case_Type_Data__c();
    ct.Level_1__c = 'Test Level 1';
    ct.Level_2__c = 'Test Level 2';
    ct.Level_3__c = 'Test Level 3';
    insert ct;      
    }
    
  @isTest
   static  void testGetLevel1()
   {
    
    Case cas = new Case(Status ='New', Priority = 'Medium', Origin = 'Email'); 
    insert cas;
    ERT_Case_Type__c  obj = new ERT_Case_Type__c ();
    obj.Level_1__c = 'Test Level 1';
    obj.Level_2__c = 'Test Level 2';
    obj.Level_3__c = 'Test Level 3';
    obj.Case__c = cas.id;
    upsert obj;
    ERT_MultiLevelSelectEdit.getLevel1(obj.id);
    
    

   }

  @isTest
   static void testGetLevel2()
   {

    List<String> s = ERT_MultiLevelSelectEdit.getLevel2('Test Level 1');

   }
    
  @isTest
   static void testGetLevel3()
   {

    List<String> s = ERT_MultiLevelSelectEdit.getLevel3('Test Level 1','Test Level 2');

   }
    
  @isTest 
   static  void testsaveCaseType(){
   
        Case cas = new Case(Status ='New', Priority = 'Medium', Origin = 'Email'); 
        insert cas;
       
        ERT_Case_Type__c obj=new ERT_Case_Type__c();
        string one='one';
        string two='two';
        string three='three';
        test.startTest();
        String testing=ERT_MultiLevelSelectEdit.savecasetype(one,two,three,cas.id);
        test.stopTest();
    }
    

    

}

Here is controller class
 

public class ERT_MultiLevelSelectEdit {
    @AuraEnabled
    public static List<LevelWrapper> getLevel1(string recID){
        List<String> tempLst1 = new List<String>();
        list<LevelWrapper> lstWrap=new list<LevelWrapper>();
        
        list<ERT_Case_Type__c>  lstertcase=new list<ERT_Case_Type__c>();
        lstertcase=[select id,Level_1__c,Level_2__c,Level_3__c from ERT_Case_Type__c where id=:recID];
        string strL1,strL2,strL3;
        if(lstertcase.size()>0){
            strL1=lstertcase[0].Level_1__c;
            strL2=lstertcase[0].Level_2__c;
            strL3=lstertcase[0].Level_3__c;
        }
        
        for(AggregateResult  ar : [select Level_1__c,COUNT(id) from Case_Type_Data__c  group by Level_1__c]) {
            LevelWrapper obj= new LevelWrapper();
            string strLev1=(string)ar.get('Level_1__c');
            obj.strLevelType='recL1';
            obj.strL1val=strLev1;
            if(strLev1==strL1)
                obj.isSelected=true;
            else
                obj.isSelected=false; 
            lstWrap.add(obj);
            
        }

        for(string ar:getLevel2(strL1)){
            if(strL1!=null){
                LevelWrapper obj= new LevelWrapper();
                
                string strLev2=(string)ar;
                obj.strLevelType='recL2';
                obj.strL2val=strLev2;
                if(strLev2==strL2)
                    obj.isSelected=true;
                else
                    obj.isSelected=false; 
                lstWrap.add(obj);
            }
        }
        
        for(string ar:getLevel3(strL1,strL2)){
            if(strL2!=null){
                LevelWrapper obj= new LevelWrapper();
                
                string strLev2=(string)ar;
                obj.strLevelType='recL3';
                obj.strL3val=strLev2;
                if(strLev2==strL3)
                    obj.isSelected=true;
                else
                    obj.isSelected=false; 
                lstWrap.add(obj);
            }
        }
        System.debug(' wrapper '+lstWrap);
        return lstWrap;
        
        
    } 
    
    @AuraEnabled
    public static List<String> getLevel2(string strName){
        List<String> tempLst2 = new List<String>();
        for(AggregateResult  ar : [select Level_2__c,COUNT(id) from Case_Type_Data__c where Level_1__c=:strName  group by Level_2__c])
        {
            tempLst2.add(''+ar.get('Level_2__c'));
        }
        
        return tempLst2;
        
    } 
    
    @AuraEnabled
    public static List<String> getLevel3(string strName1,string strName2){
        List<String> tempLst3 = new List<String>();
        for(AggregateResult  ar : [select Level_3__c,COUNT(id) from Case_Type_Data__c  where Level_1__c=:strName1 and Level_2__c=:strName2 group by Level_3__c])
        {
            tempLst3.add(''+ar.get('Level_3__c'));
        }
        
        return tempLst3;
        
        
    } 
    
    @AuraEnabled
    public  static String  savecasetype(string level1,string level2,string level3,string id){
        string strMsg='successfull';
        try{
            ERT_Case_Type__c obj=new ERT_Case_Type__c();
            
            System.debug('CASE  = '+ Obj.Case__c); 
            Obj.Level_1__c=level1;
            System.debug('Level1  = '+ Obj.Level_1__c); 
            Obj.Level_2__c=level2;
            System.debug('Level2  = '+ Obj.Level_2__c); 
            Obj.Level_3__c=level3;
            System.debug('Level3  = '+ Obj.Level_3__c);
            if(id.startsWithIgnoreCase('500'))
                Obj.Case__c = id;
            else
                obj.id=id;
            upsert  obj;
            
        }
        
        catch(Exception ex){
            strMsg='error';
        }
        return strMsg;  
    }
    
    public class LevelWrapper{
        @AuraEnabled
        public string strLevelType{get;set;}
        @AuraEnabled
        public string strL1val{get;set;}
        @AuraEnabled
        public string strL2val{get;set;}
        @AuraEnabled
        public string strL3val{get;set;}
        @AuraEnabled
        public boolean isSelected{get;set;}
        
    }
    
    
    
 }

Regards
Fiona