How do I cover "UPDATE" in my test class?

CLASS:
public class R2MPipeLineController{
    public List<Opportunity> listOfLive {get; set;}
    public List<Opportunity> listOfViability {get; set;}
    public List<Opportunity> listOfLaunchPad {get; set;}
    public List<Opportunity> listOfContractSent {get; set;}
    public List<Opportunity> listOfQualified {get; set;}
    public Opportunity Live {get; set;}
    public Opportunity Viability {get; set;}
    public Opportunity LaunchPad {get; set;}
    public Opportunity ContractSent {get; set;}
    public Opportunity Qualified {get; set;}
    public PageReference saveCS(){
    UPDATE listOfContractSent;
    return null;
    }
    public PageReference saveVI(){
    UPDATE listOfViability;
    return null;
    }
    public PageReference saveLP(){
    UPDATE listOfLaunchPad;
    return null;
    }
    public PageReference saveQD(){
    UPDATE listOfQualified;
    return null;
    }
    public String getName(){
        return 'R2MPipeLineController';
        }
public R2MPipeLineController() {
    listofLive = [Select id, name, CreatedDate, Company_Name__c, Next_Step__c, Vertical__c, Weeks_Live__c, Days_Since_Last_Modified__c, Contract_SENT__c, NextStep, LeadSource, Probability, Spend_Last_Week__c, Spend_Last_30_Days__c, Owner_Name__c, Revenue_All_Time__c from Opportunity WHERE StageName = 'Live' ORDER BY Weeks_Live__c DESC];
    listOfViability = [Select id, name, Amount, Projected_Revenue__c, CreatedDate, Company_Name__c, Next_Step__c, Vertical__c, Weeks_Live__c, Days_Since_Last_Modified__c, Contract_SENT__c, NextStep, LeadSource, Probability, Spend_Last_Week__c, Spend_Last_30_Days__c, Owner_Name__c, Revenue_All_Time__c from Opportunity WHERE StageName = 'Viability' ORDER BY Days_Since_Last_Modified__c DESC];
    listOfLaunchPad = [Select id, name, Amount, Projected_Revenue__c, CreatedDate, Company_Name__c, Next_Step__c, Vertical__c, Weeks_Live__c, Days_Since_Last_Modified__c, Contract_SENT__c, NextStep, LeadSource, Probability, Spend_Last_Week__c, Spend_Last_30_Days__c, Owner_Name__c, Revenue_All_Time__c from Opportunity WHERE StageName = 'Launch Pad' ORDER BY Days_Since_Last_Modified__c DESC];
    listOfContractSent = [Select id, name, Amount, Projected_Revenue__c, CreatedDate, Company_Name__c, Next_Step__c, Vertical__c, Weeks_Live__c, Days_Since_Last_Modified__c, Contract_SENT__c, NextStep, LeadSource, Probability, Spend_Last_Week__c, Spend_Last_30_Days__c, Owner_Name__c, Revenue_All_Time__c, Contract_Age__c from Opportunity WHERE StageName = 'Contract Sent' ORDER BY Contract_Age__c ASC];
    listOfQualified = [Select id, name, Amount, Projected_Revenue__c, CreatedDate, Company_Name__c, Next_Step__c, Vertical__c, Weeks_Live__c, Days_Since_Last_Modified__c, Contract_SENT__c, NextStep, LeadSource, Probability, Spend_Last_Week__c, Spend_Last_30_Days__c, Owner_Name__c, Revenue_All_Time__c from Opportunity WHERE StageName = 'Qualified' ORDER BY Probability DESC]; 
}
}

@isTest(seeAllData = false)
public class R2MPipeLineControllerTest{
    // Unit test Method
    static testmethod void UnitTest() {
        //Create your buyer record with required field
        //Opportunity o = new Opportunity(StageName = 'Qualified');
        //insert o;
        test.startTest();
           R2MPipeLineController qo = new R2MPipeLineController();
        test.stopTest();
    }   
}