protected function calculateRowLength(array $field_lengths, int $seperator_padding, string $seperator)
    {
        $sample_row = $seperator . $this->su->fill($seperator_padding);
        for ($i = 0; $i < count($field_lengths); $i++) {
            $sample_row .= $this->su->fill($field_lengths[$i]) . $this->su->fill($seperator_padding) . $seperator . $this->su->fill($seperator_padding);
        }
        $sample_row = rtrim($sample_row);
        return strlen($sample_row);
    }