public function tearDown()
{
parent::tearDown();
Config::inst()->remove('VirtualPage', 'initially_copied_fields');
Config::inst()->remove('VirtualPage', 'non_virtual_fields');
VirtualPage::config()->initially_copied_fields = $this->origInitiallyCopiedFields;
VirtualPage::config()->non_virtual_fields = $this->origNonVirtualField;
}