在mongodb findOne回调中没有发射sinon间谍

Question

我正在尝试测试类似的代码

testFind = (cb) ->
  cb()
wrapper = (fn) ->
  (req, mongodb) ->
    users = mongodb.db.collection("user")
    # fired here
    fn req, mongodb

    testFind (err, user) ->
      #fired here
      fn req, mongodb

    users.findOne
      "username": "user1"
    , (err, user) ->
      console.log "user is valid", user
      console.log "req.done is still a spy object", req.done
      #not fired here
      fn req, mongodb



test = wrapper (req, mongodb) ->
  req.done 200

module.exports = test

并传递req.done的间谍。正如上面的评论中提到的，间谍永远不会在mongodb回调中被触发，即使它是一个有效的间谍对象并且调用了回调。但它在它之外工作。如果我用调用回调的本地示例函数替换mongodb findOne，它也可以工作。这是测试代码

mongodb = {}
describe.only "test:", ->
  before (done) ->
    this.timeout(5000)
    MongoClient.connect "mongodb://localhost/test", (err, db) ->
      if err?
        done err
      mongodb.db = db
      done()
  it "should fire complete", ->
    @req =
      complete: sinon.spy().named("complete")
    test @req, mongodb
    @req.complete.should.have.been.calledThrice