public function testWriteReadDestroy()
{
$sessionId = 'my_test_id';
$data = serialize(array('test key' => 'test value'));
$this->_model->write($sessionId, $data);
$this->assertEquals($data, $this->_model->read($sessionId));
$data = serialize(array('new key' => 'new value'));
$this->_model->write($sessionId, $data);
$this->assertEquals($data, $this->_model->read($sessionId));
$this->_model->destroy($sessionId);
$this->assertEmpty($this->_model->read($sessionId));
}