provide a way to enrich/customize output promise in 4.0

[sebv]

I was using chai-as-promised to do some chaining like this:

browser
  .init({browserName:'chrome'})
  .get("http://admc.io/wd/test-pages/guinea-pig.html")
  .title()
    .should.become('I am a page title - Sauce Labs')
  .elementById('i am a link')
  .click()
  .eval("window.location.href")
    .should.eventually.include('guinea-pig2')
  .fin(function() { return browser.quit(); })
  .done();

(see wd project)

It was working fine before 4.0, cause the input and output promise were the same, but now the chain broken cause all there is is a then method.

Now I understand why the 4.0 rewrite is simpler, but it would be good to be able to enrich the output. For example if you are using Q promise, and you cannot do something like this, it does not feel right.

var promise = Q.fcall(function() {return "1234";});
promise.should.become('1234').done();

[sebv]

Am thinking of something like this:

sebv/chai-as-promised@domenic:master...master

Not sure if it is the best way to customize chai,but it is flexible and easy to test.

[sebv]

closing since pull request was opened.