jspec.junit.js

;(function(){
  JSpec.include({
    name: 'JUnit',
    formatters : {
      JUnitXML : function(results, options){
        each(results.allSuites, function(suite){
          ...
        })
      }
    }
  })
})

...
function runSuites() {
	JSpec
	.exec('spec.js')
	.run({ formatter : JSpec.formatters.JUnitXML })
	.report()
}
...