Javascript 茉莉花窥探不存在的物体
我有一个主干路由器,它具有以下操作:Javascript 茉莉花窥探不存在的物体,javascript,backbone.js,coffeescript,jasmine,Javascript,Backbone.js,Coffeescript,Jasmine,我有一个主干路由器,它具有以下操作: index: -> @collection = new App.Collections.ThingsCollection() @collection.fetch success: -> # ... 我试图用Jasmine测试这个函数,测试如下: it 'fetches the collection from the server', -> @router.index() expect(@router.collect
index: ->
@collection = new App.Collections.ThingsCollection()
@collection.fetch success: ->
# ...
我试图用Jasmine测试这个函数,测试如下:
it 'fetches the collection from the server', ->
@router.index()
expect(@router.collection.fetch).toHaveBeenCalled()
当尝试为
@router.collection.fetch()
创建间谍时,会出现困难。因为在实际调用@router.index()
函数之前,@router.collection
不存在,所以我无法创建这样的间谍
@fetchStub = spyOn(@router.collection, 'fetch')
…因为
@router.collection
还不存在。我没有将@collection
的构造放在initialize()
函数中,因为对于不使用它的函数,例如new()
,似乎没有必要使用它。对此可能有一个众所周知的解决方案,但我一直找不到。任何帮助都将不胜感激
更新
到目前为止,我就是这样解决的,但是一个更优雅的解决方案会更好
initialize: ->
@collection = new App.Collections.ThingsCollection()
index: ->
if @collection.models.length > 0
# Assumes @collection.fetch() has already been called (i.e. switching between actions)
view = new App.Views.ThingsIndex(collection: @collection)
$('#app-container').html(view.render().el)
else
# Assumes @collection.fetch() has not been called (i.e. a new page view or refresh)
that = this
@collection.fetch success: ->
view = new App.Views.ThingsIndex(collection: that.collection)
$('#app-container').html(view.render().el)
这样我就可以拥有以下规格:
describe 'App.Routers.ThingsRouter', ->
beforeEach ->
@router = new App.Routers.ThingsRouter
@fetchStub = spyOn(@router.collection, 'fetch')
it 'fetches the collection from the server', ->
@router.index()
expect(@fetchStub).toHaveBeenCalled()
那么,在您的
before
功能中:
@router.collection = new App.Collections.ThingsCollection()
还有更多相关信息。
@router.collection
将在index()
函数中重新创建,因此这实际上不会起任何作用。感谢您的更新,@clem!