private function createTable(): void
    {
        $statement = 'CREATE TABLE tests (
                          id INTEGER PRIMARY KEY,
                          command TEXT NOT NULL UNIQUE,
                          file_name TEXT NOT NULL,
                          reserved_by_process_id INTEGER,
                          completed INTEGER DEFAULT 0
                        )';

        if ($this->db->exec($statement) === false) {
            throw new Exception('Error while creating sqlite database table: ' . $this->db->errorCode());
        }
    }