PHPUnit\Runner\CleverAndSmart\Exception\StorageException::databaseError PHP Method

    public static function databaseError($errorMessage, $errorCode)
    {
        return new static(sprintf('%s (error code %s)', $errorMessage, $errorCode));
    }

 private function doQuery($query)
 {
     $result = $this->db->query($query);
     if ($this->db->lastErrorCode() > 0) {
         throw StorageException::databaseError($this->db->lastErrorMsg(), $this->db->lastErrorCode());
     }
     return $result;
 }