function setUp()
{
$pdo = new PdoDataSource(self::DSN);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$pdo->beginTransaction();
$pdo->exec('CREATE TABLE table_b (id INTEGER PRIMARY KEY AUTOINCREMENT, column_b STRING)');
$pdo->exec('CREATE TABLE table_a (id INTEGER PRIMARY KEY AUTOINCREMENT, column_a STRING)');
$pdo->commit();
$this->source = $pdo;
}
