Testing then statement in the Q framework to assert then() return's a wrapped promise callback. "Give me a callback for this promise and I'll give you a promise that represents the result of that callback."

gistfile1.js

(function() {
  q = require('q');
  var one,two,three;

  function asyncOne() {
    console.log('one called');
    var allDone = q.defer();
    setTimeout(allDone.resolve, 1000);
    return allDone.promise;
  }

  function asyncTwo() {
    console.log('two called');
    var allDone = q.defer();
    setTimeout(allDone.resolve, 1000);
    return allDone.promise;
  }

  function asyncThree() {
    console.log('three called');
    var allDone = q.defer();
    setTimeout(allDone.resolve, 1000);
    return allDone.promise;
  }

  console.log("Testing 'then' mimics jQuery's pipe");
  var oneDone = asyncOne();
  var twoDone = oneDone.then( asyncTwo );
  var threeDone = twoDone.then( asyncThree );

  oneDone.then( function() { console.log('one is done') } );
  twoDone.then( function() { console.log('two is done') } );
  threeDone.then( function() { console.log('three is done') } );
})();