public function setUp()
 {
     if (!extension_loaded('pdo') || !extension_loaded('pdo_sqlite')) {
         $this->markTestSkipped('PDO and SQLite extensions are required.');
     }
     $this->_connection = new CDbConnection('sqlite::memory:');
     $this->_connection->active = true;
     $this->_connection->pdoInstance->exec(file_get_contents(dirname(__FILE__) . '/../data/sqlite.sql'));
     CActiveRecord::$db = $this->_connection;
     UserWithWrappers::clearCounters();
     PostWithWrappers::clearCounters();
     CommentWithWrappers::clearCounters();
 }