Redmine

        if /(?![\r\n\t ])[[:cntrl:]]/.match?(text)

            text.gsub!(/(?![\r\n\t ])[[:cntrl:]]/, '')

        end

        if /^ +\S/.match?(text)

            indt = 0

            indt += 1 while !/^ {#{indt}}\S/.match?(text)

    raw = <<~RAW

      * Item-1

        * Item-1a

        * Item-1b

    RAW

    expected = <<~EXPECTED

      <ul>

        <li>Item-1

          <ul>

            <li>Item-1a</li>

            <li>Item-1b</li>

          </ul>

        </li>

      </ul>

    EXPECTED

    assert_equal expected.gsub(%r{\s+}, ''), to_html(raw).gsub(%r{\s+}, '')