Fill the CC form with fake data

gistfile1.js

javascript:(function() {
  $('#billing_number').val("4111 1111 1111 1111"); 
  $('#billing_expiration_date').val("02/2015"); 
  $('#billing_cvv').val("123"); 
  $('#billing_billing_address_postal_code').val("94110");
  $('.select-country').val('United States of America');
  $('.select-state').val('California');
})();