gistfile1.txt

> var chai = require('chai')
> chai.use(require('chai-as-promised'))
> var q = require('q')
> chai.should()
> var r = q.resolve(555).should.eventually.equal(3)
> var e
> r.fail(function(err) { e = err })
> e
{ message: 'expected 555 to equal 3',
  actual:
   { ... },
  expected: 3,
  operator: undefined,
  showDiff: true }