Sabre\CardDAV\Backend\PDO::getCards PHP Method

    function getCards($addressbookId)
    {
        $stmt = $this->pdo->prepare('SELECT id, uri, lastmodified, etag, size FROM ' . $this->cardsTableName . ' WHERE addressbookid = ?');
        $stmt->execute([$addressbookId]);
        $result = [];
        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
            $row['etag'] = '"' . $row['etag'] . '"';
            $result[] = $row;
        }
        return $result;
    }

 function testGetCards()
 {
     $result = $this->backend->getCards(1);
     $expected = [['id' => 1, 'uri' => 'card1', 'lastmodified' => 0, 'etag' => '"' . md5('card1') . '"', 'size' => 5]];
     $this->assertEquals($expected, $result);
 }