public function testDeleteKey()
{
$config = new \OC\AppConfig(\OC::$server->getDatabaseConnection());
$this->assertTrue($config->hasKey('testapp', 'deletethis'));
$config->deleteKey('testapp', 'deletethis');
$this->assertFalse($config->hasKey('testapp', 'deletethis'));
$sql = \OC::$server->getDatabaseConnection()->getQueryBuilder();
$sql->select('configvalue')->from('appconfig')->where($sql->expr()->eq('appid', $sql->createParameter('appid')))->andWhere($sql->expr()->eq('configkey', $sql->createParameter('configkey')))->setParameter('appid', 'testapp')->setParameter('configkey', 'deletethis');
$query = $sql->execute();
$result = $query->fetch();
$query->closeCursor();
$this->assertFalse($result);
}
