version check for nokogiri

test.rb

  if node['xml']['nokogiri']['use_system_libraries']
    if node['xml']['nokogiri']['version'].nil? ||
       version(node['xml']['nokogiri']['version']).satisfies?('> 1.6.1')
         Chef::Application.fatal!("You must specify a version less than or equal to 1.6.1 of nokogiri to use system libraries. You set: #{node['xml']['nokogiri']['version']}.")
    else
    ENV['NOKOGIRI_USE_SYSTEM_LIBRARIES'] = node['xml']['nokogiri']['use_system_libraries'].to_s
    end
  end