function tearDown()
  {
    parent :: tearDown();

    $user =& user :: instance();
    $user->logout();
  }
 function tearDown()
 {
 	parent :: tearDown();
 	
 	$this->db->sql_delete('user');
 	$this->db->sql_delete('sys_site_object');
 }
 function tearDown()
 {
   parent :: tearDown();
   $this->_clean_up();
 }