Hi All,

I have been stuck in test class and not getting a way to solve the issue.Upon running the test class I am getting error :System.DmlException: Update failed. First exception on row 0; first error: MISSING_ARGUMENT, Id not specified in an update call: []
Below is the CONTROLLER snippets:

public class SurveyForDriverController{
    
    //class variables
    public Driver_Survey__c survey{get;set;}
    public String newSurveyList {get;set;}
    public String newSurveyListSecond {get;set;}
    public String newSurveyListThird {get;set;}
    public String newSurveyListFourth {get;set;}
    public String newSurveyListFifth {get;set;}
  

    public SurveyForDriverController(ApexPages.StandardController controller){
        
 system.debug('message3>>****'+ApexPages.currentPage().getParameters().get('recordID') );
      
        if (ApexPages.currentPage().getParameters().get('recordID') !=null)
           survey = [SELECT Id, Name__c, Mobile__c, Email__c, 
                     from Driver_Survey__c where id = :ApexPages.currentPage().getParameters().get('recordID')  ];
         
		else
            survey=new Grab_Driver_Survey__c();
     
    }
   

    public PageReference doFullSave(){
       
        survey.Customer_Experience__c=newSurveyList;
       	insert survey; 
        

        PageReference pageRef = new PageReference('/'+survey.Id);
        pageRef.setRedirect(true);
        return pageRef;  
        }
    
    public PageReference saveRecord( ) {

        survey.Customer_Experience__c=newSurveyList;
        update survey;   
        return Page.DriverSurveyThankyouVF;
        }
    public void doCancel(){
        PageReference pageRef = new PageReference('/');
            pageRef.setRedirect(true);
           
    }
    
}

Below is my test clas:

@isTest
public class TestSurveyForDriverController {

    
     static testMethod void testForSalesforceUsers () {
        
         Profile p = [SELECT Id FROM Profile WHERE Name='Standard User']; 
         Driver_Survey__c driverSurvey=new Driver_Survey__c();
        ApexPages.StandardController ctlr = new ApexPages.StandardController(driverSurvey);
       	SurveyForDriverController grabController=new SurveyForDriverController(ctlr);
		Test.startTest();
            grabController.survey.Customer_Experience__c='6';
            grabController.survey.Email__c='test@test.com';
            grabController.survey.Expected_Earnings_Weekly__c=10000;
            grabController.survey.Name='testuser1';
            grabController.survey.Name__c='testuser1';

            grabController.doFullSave();
         	grabController.doCancel();
		Test.stopTest();
       
    }
    
        static testMethod void testForExternalUsers () {
        
         Profile p = [SELECT Id FROM Profile WHERE Name='Transport Questionnaire Profile']; 
         Driver_Survey__c driverSurvey=new Driver_Survey__c();
        ApexPages.StandardController ctlr = new ApexPages.StandardController(driverSurvey);
       	SurveyForDriverController grabController=new SurveyForDriverController(ctlr);
		Test.startTest();
        
            driverSurvey.Name='testuser1';
            driverSurvey.Name__c='testuser1';
            driverSurvey.Email__c='emailuser@testorg.com';
            
            Driver_Survey__c driverSurvey1=new Driver_Survey__c();
            ApexPages.StandardController ctlr1 = new ApexPages.StandardController(driverSurvey1);
       	SurveyForDriverController grabController1=new SurveyForDriverController(ctlr1);
            driverSurvey1.Name__c='testuser2';
            driverSurvey1.Email__c='emailuser@testorg.com';

 	driverSurvey1.Id=driverSurvey.id;
 	update driverSurvey1;  
         grabController.saveRecord();
            
		Test.stopTest();
       
    }
}

Kindly help

Many thanks in advance​​​​​​​