如何解决Vows和Node.js的“回调未被解雇”

我正试图开始使用 Vows和 Vows-BDD.不幸的是,回调让我感到沮丧.

在下面这个非常简单的例子中,如何修复此错误？

** Inside the first context
** Creating Person with name Nick

✗ Errored » callback not fired
      in Create a Person via JavaScript: When a person has a name,
      in Creating a Person
      in undefined✗ Errored » 1 errored  1 dropped

vows_bdd  = require "vows-bdd"
assert    = require "assert"


class Person
  constructor: (@name) ->
    console.log "** Creating Person with name #{@name}"

  greeting: ->
    "Hello, #{@name}"


vows_bdd
  .Feature("Creating a Person")
    .scenario("Create a Person via JavaScript")

    .when "a person has a name", ->
      console.log "** Inside the first context"
      new Person "Nick"

    .then "the person can be greeted", (person) ->
      console.log "person is a #{typeof person} = [#{person}]"
      assert.equal person.greeting(), "Hello, Nick"

    .complete()
    .finish(module)

我知道这篇文章已经过时了,但由于这是有人搜索此错误时的第一个结果,我发布了我的答案.

在处理错误时,我发现这篇文章很有帮助.
http://birkett.no/blog/2013/05/01/vows-errored-callback-not-fired/.

在我的代码中,错误是由于其中一个主题发生异常.誓言不打印实际错误,因为它很难理解确切的问题.