Need 100% result in Test Class : In PageReference

class:
public with sharing class contactInsert {
public contact myC{get;set;}
public contactInsert(){
myC = new Contact();
}
public PageReference iSave(){
insert myC;
return new pageReference('/'+myC.id);
}
}

Page:

and I created Test Class but it cant recover PageReference...

@isTest
public with sharing class TestcontactInsert {
@isTest
private static void myTest(){
contact c = new contact(firstname='fnam',lastname='lnam',email='a@a.com',phone='89898989'); insert c;

     PageReference pageRef = Page.InsertContact;
     Test.setCurrentPage(pageRef);

     ContactInsert ci = new ContactInsert();
     ci.iSave();
}

}