hi i have written a test method for a contoller class.when i run the test i am getting 100% class coverage. The problem is i am updating a custom object using this controller. I have created a trigger so that whenewver a update is done on the custom object filed.if the email in custom obect existing in lead or contact it should update those objects correspondingly. so the trigger coverage in the controller class is only 52% since the email is existing in only lead or contact.

the overall coverage came down to 65%. How can i avoid this and deploy the controller.

global with sharing class preferenc 
{

    public PageReference cancel() {
        PageReference p = Page.user_preference;
         p.setRedirect(true);
          return p;
    }


    

 public string guestid;
    public guestuser__c gus{get;set;}

    public preferenc() 
    {
    this.guestid=ApexPages.currentPage().getParameters().get('paramID');   
        if(guestid!=null||guestid!='')
        {
            getdetails(guestid); 
        }   

    }

    
    
    public void getdetails(string guestid)
    {
        List<guestuser__c> guests=[select id,Email__c,Phone__c,Title__c,Email_Optout__c,A_H_interests__c,After_Markets_interests__c,Construction_interests__c,D_O_interests__c,Energy_interests__c,Environmental_interests__c,Financial_Enterprises_interests__c,Healthcare_interests__c,Manufacturing_interests__c,Property_interests__c,RealEstate_interests__c,Technology_interests__c,Windstorm_notification_interests__c from guestuser__c where id=:guestid];
        if(guests.size()>0)
        {
            gus=guests[0];
        }
        else
        {
            
        }
    }
    public PageReference save()
    {
        
          update gus;
          PageReference t = Page.thanks;
          t.setRedirect(true);
          return t;  
    } 
    
    static testMethod void testpreferenc()
    {
     
       ApexPages.currentPage().getParameters().put('paramID','a0RQ0000000B0On');
       preferenc controller = new preferenc();
       controller.save();    
       controller.cancel();
      
      
       }
    
}

the is i passed in the test method is a custom object record with the email existing in lead. so the trigger is covering only the lead updation part.

the trigger code is below.

trigger LeadUpdate on guestuser__c (after update) {

//guestuser__c gu = new guestuser__c();
//list<guestuser__c> gst =[];
list<Lead> newlead = [select id,email,phone,title,HasOptedOutOfEmail,A_H_Interest__c,Aftermarket_Interest__c,Construction_Interest__c,D_O_Interest__c,Energy_Interest__c,Environmental_Interest__c,Financial_Enterprises_Interest__c,Healthcare_Interest__c,Property_Interest__c,Real_Estate_Interest__c,Manufacturing_Interest__c,Technology_Interest__c,Windstorm_Notification__c from Lead where email=:Trigger.new[0].Email__c];
list<Contact>newcon = [select id,email,phone,title,HasOptedOutOfEmail,A_H_Interest__c,Aftermarket_Interest__c,Construction_Interest__c,D_O_Interest__c,Energy_Interest__c,Environmental_Interest__c,Financial_Enterprises_Interest__c,Healthcare_Interest__c,Property_Interest__c,Real_Estate_Interest__c,Manufacturing_Interest__c,Technology_Interest__c,Windstorm_Notification__c from Contact where email=:Trigger.new[0].Email__c];
if(newlead.size()>0)
{
newlead[0].Email = Trigger.new[0].Email__c;
newlead[0].Phone = Trigger.new[0].Phone__c;
newlead[0].title = Trigger.new[0].Title__c;
newlead[0].HasOptedOutOfEmail = Trigger.new[0].Email_Optout__c;
newlead[0].A_H_Interest__c = Trigger.new[0].A_H_interests__c;
newlead[0].D_O_Interest__c = Trigger.new[0].D_O_interests__c;
newlead[0].Real_Estate_Interest__c = Trigger.new[0].RealEstate_interests__c;
newlead[0].Property_Interest__c = Trigger.new[0].Property_interests__c;
newlead[0].Healthcare_Interest__c = Trigger.new[0].Healthcare_interests__c;
newlead[0].Aftermarket_Interest__c = Trigger.new[0].After_Markets_interests__c;
newlead[0].Construction_Interest__c = Trigger.new[0].Construction_interests__c;
newlead[0].Energy_Interest__c = Trigger.new[0].Energy_interests__c;
newlead[0].Financial_Enterprises_Interest__c = Trigger.new[0].Financial_Enterprises_interests__c;
newlead[0].Environmental_Interest__c = Trigger.new[0].Environmental_interests__c;
newlead[0].Manufacturing_Interest__c = Trigger.new[0].Manufacturing_interests__c;
newlead[0].Technology_Interest__c = Trigger.new[0].Technology_interests__c;
newlead[0].Windstorm_Notification__c = Trigger.new[0].Windstorm_notification_interests__c;

update newlead;
}
else
{
  if(newcon.size()>0)
  {
  newcon[0].Email = Trigger.new[0].Email__c;
    newcon[0].Phone = Trigger.new[0].Phone__c;
    newcon[0].title = Trigger.new[0].Title__c;
    newcon[0].HasOptedOutOfEmail = Trigger.new[0].Email_Optout__c;
    newcon[0].A_H_Interest__c = Trigger.new[0].A_H_interests__c;
    newcon[0].D_O_Interest__c = Trigger.new[0].D_O_interests__c;
    newcon[0].Real_Estate_Interest__c = Trigger.new[0].RealEstate_interests__c;
    newcon[0].Property_Interest__c = Trigger.new[0].Property_interests__c;
    newcon[0].Healthcare_Interest__c = Trigger.new[0].Healthcare_interests__c;
    newcon[0].Aftermarket_Interest__c = Trigger.new[0].After_Markets_interests__c;
    newcon[0].Construction_Interest__c = Trigger.new[0].Construction_interests__c;
    newcon[0].Energy_Interest__c = Trigger.new[0].Energy_interests__c;
    newcon[0].Financial_Enterprises_Interest__c = Trigger.new[0].Financial_Enterprises_interests__c;
    newcon[0].Environmental_Interest__c = Trigger.new[0].Environmental_interests__c;
    newcon[0].Manufacturing_Interest__c = Trigger.new[0].Manufacturing_interests__c;
    newcon[0].Technology_Interest__c = Trigger.new[0].Technology_interests__c;
    newcon[0].Windstorm_Notification__c = Trigger.new[0].Windstorm_notification_interests__c;
  update newcon;  
  }
}
}