# File ext/libxml/tests/tc_xml_document.rb, line 24
  def test_ruby_xml_document_compression()
    if XML::Parser::enabled_zlib?
      0.upto(9) do |i|
        assert_equal(i, @doc.compression = i)
        assert_equal(i, @doc.compression)
      end

      9.downto(0) do |i|
        assert_equal(i, @doc.compression = i)
        assert_equal(i, @doc.compression)
      end

      10.upto(20) do |i|
        # assert_equal(9, @doc.compression = i)
        assert_equal(i, @doc.compression = i) # This works around a bug in Ruby 1.8
        assert_equal(9, @doc.compression)
      end

      -1.downto(-10) do |i|
        # assert_equal(0, @doc.compression = i)
        assert_equal(i, @doc.compression = i) # This bug should get fixed ASAP
        assert_equal(0, @doc.compression)
      end
    end # if ...enabled_zlib?
  end