server.rb

post '/junit-results' do
  result = JSON.parse(request.body.read)
  passes = result['stats']['passes']
  failures = result['stats']['failures']
  File.open(File.dirname(__FILE__) + '/../../target/artifacts/reports/javascript.xml', 'w') do |f|
    xml = Builder::XmlMarkup.new
    suite = xml.testsuite :errors => 0, :failures => failures, :tests => passes, :name => "javascript.tests" do
      result['results'].each do |tc|
        unless tc.nil?
          tc['specs'].each do |s|
            xml.testcase :classname => tc['description'], :name => s['description'] do
              if s['status'] != 'pass'
                xml.failure s['assertions'].inspect, :message => s['assertions'].inspect
              end
            end
          end
        end
      end
    end
    f.write suite
  end
end