my apex classs..........

public with sharing class extController {

    public Document document { get; set; }
   
    public Line_Of_Business__c businessfetchedData{get; set;}
    public Line_Of_Business__c businessfetchedDataToSave{get; set;}
    public string lineDisciplineValue{get; set;}
    public Question__c ques {get; set;}-
   
    public extController() {
        ques = new Question__c();
    }
   
   
   
    public List<SelectOption> getItems() {
        List<Line_Of_Business__c> getBusinessRecs  =  new List<Line_Of_Business__c>([Select Id,Name from Line_Of_Business__c limit 50000]);
        List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('','--None--'));
        for(Line_Of_Business__c business : getBusinessRecs){
            options.add(new SelectOption(business.Name,business.Name));
        }
       
       
        return options;
    }
   
    public Pagereference getRelatedValues(){
        string businessLine = ApexPages.currentPage().getParameters().get('businessValue');
        businessfetchedData = [Select Id,Name ,Subject_Matter_Expert__r.Name ,Subject_Matter_Expert__r.Email from Line_Of_Business__c where Name =:businessLine];
        return null;
    }
   
    public Pagereference saveQuestion(){
        businessfetchedDataToSave = [Select Id,Name ,Subject_Matter_Expert__r.Name ,Subject_Matter_Expert__r.Email from Line_Of_Business__c where Name =:lineDisciplineValue];
        Question__c q = new Question__c ();
        q.Line_Of_Discipline_C__c = businessfetchedDataToSave.Id;
        User u = [select id from user where user.Name=:businessfetchedDataToSave.Subject_Matter_Expert__r.Name];
        q.Line_Of_Discipline_Focal_Point__c = u.id;
        q.Line_Of_Discipline_Focal_Point_Email__c = businessfetchedDataToSave.Subject_Matter_Expert__r.Email;
        q.Priority_C__c = ques.Priority_C__c;
        q.Title_C__c = ques.Title_C__c;
        q.Question_C__c = ques.Question_C__c;
        q.Status_C__c = 'Open';
        insert q;
       
        return null;
    }

my test class.....testclass was failing not getting green tick mark...................


@isTest
public class testcontroller
{
static testmethod void testingex()
{
Account ad=new Account(Name='rahul',Phone='8989899');
insert ad;
Opportunity op=new Opportunity(Name='gandhi',CloseDate=System.today(), StageName='prospecting');
insert op;
Line_Of_Business__c lb=new Line_Of_Business__c(name='rajendra');
insert lb;
Document d=new Document();
    
Test.starttest();
PageReference pageRef = Page.sccquestionFormSubmission;
pageRef.getParameters().put('id', String.valueOf(lb.Id));
Test.setCurrentPage(pageRef);
extController q = new extController();
q.lineDisciplineValue='business';
q.companySiteValue='business1';
List<SelectOption> so = q.getItems();

so=q.getSites();
q.savequestion();
   
//so=qd.getItems();
Test.stopTest();
    System.assertEquals(null,q.lineDisciplineValue);
    System.assertEquals(null,q.companySiteValue);
 
    
}
static testmethod void testingexx()
{
Account ac=new Account(Name='rahul',Phone='8989899');
insert ac;
Opportunity opp=new Opportunity(Name='gandhi',CloseDate=System.today(), StageName='prospecting');
insert opp;
question__c qd=new   question__c(Status_C__c = 'Open', Site__c = 'companySiteValue');
insert qd;
    
Test.starttest();
extController tes = new extController();
PageReference Ref = Page.sccquestionFormSubmission;
Ref.getParameters().put('id', String.valueOf(qd.Id));
Test.setCurrentPage(Ref);
tes.getRelatedValues();
    
Test.stopTest();
}
static testmethod void testingexxx()
{
 extController tes = new extController();
    tes.savequestion();
 Question__c que = new Question__c ();
    que.Status_C__c = 'open' ;
    insert que;
}
 
   
}