public function testArrayConversion()
{
$time = time();
$doc = new Document(array('data' => array('_id' => new MongoId(), 'date' => new MongoDate($time))));
$result = $doc->data();
$this->assertPattern('/^[a-f0-9]{24}$/', $result['_id']);
$this->assertEqual($time, $result['date']);
}