service.js

var microlib = require('microlib');

module.exports = {
  addTwoMicroservice: microlib.builder
    .setFunction(function(one, two) {
      return one + two;
    })
    .build()
    // spinUpON is provided by the builder
}

supertruth.js

var addTwoMS = require('addTwoMicroservice');

addTwoMS
// we have to create the service
.spinUpOn(os.environ.GIVE_ME_IT_SERVICE_URL)
.then(function(service) {
  return service.addTwo(4,5) === service.addTwo(5,4);
})