Javascript 测试 : Passing around Jasmine 2. 0's "完成“功能 - 不是我所期望的

Question

我对异步测试比较陌生，以下行为让我感到惊讶。我错过了什么？我很感激有人指出我正确的方向

如果这有效 [Coffeescript]:

# Works
describe "Asynchronous specs", ->
    o = {}    
    beforeEach (done) ->        
        o.async = ->
            console.log "Finished"

        spyOn o, "async"
        setTimeout (->
            o.async()
            done()
        ), 1500

    it "async executed", ->        
        expect o.async
            .toHaveBeenCalled()

为什么将 done() 函数作为参数传递也不起作用？

# doesnt work: Test times out
describe "Asynchronous specs", ->
    o = {}    
    beforeEach (done) ->        
        o.async = (passedDone)->
            passedDone()
            console.log "Finished"

        spyOn o, "async"
        setTimeout (=>
            o.async done
        ), 1500

    it "async executed", ->        
        expect o.async
            .toHaveBeenCalled()

Answer 1

async 方法将永远不会在第二个示例中被调用，因为它被监视了。你可以改变

spyOn o, "async"

到

spyOn(o, "async").and.callThrough()

所以该方法被侦测并且所有调用都被委托(delegate)给 async 方法。