public function testMultipleInstances() {
$storage1 = new PdoSessionHandler($this->pdo, array(
'db_table' => 'sessions',
), array());
$storage1
->write('foo', 'bar');
$storage2 = new PdoSessionHandler($this->pdo, array(
'db_table' => 'sessions',
), array());
$this
->assertEquals('bar', $storage2
->read('foo'), 'values persist between instances');
}