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

    function deleteCard($addressBookId, $cardUri)
    {
        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->cardsTableName . ' WHERE addressbookid = ? AND uri = ?');
        $stmt->execute([$addressBookId, $cardUri]);
        $this->addChange($addressBookId, $cardUri, 3);
        return $stmt->rowCount() === 1;
    }

 /**
  * @depends testGetCard
  */
 function testDeleteCard()
 {
     $this->backend->deleteCard(1, 'card1');
     $result = $this->backend->getCard(1, 'card1');
     $this->assertFalse($result);
 }