angularjs – 如何使用Jasmine监视Angular承诺链

假设我有以下示例服务：

角度服务

class ExampleService
    stepData: []
    constructor: (@$http) ->

    attachScopeMethod: (@scope) ->
        @scope.callSteps = => @step1().then -> @step2()

    step1: ->
        @$http.get('app/step/1').then (results) =>
            @stepData[0] = results.data
            results

    step2: ->
        @$http.get('app/step/2').then (results) =>
            @stepData[2] = results.data
            results

此服务允许我将方法callSteps()附加到范围.调用此方法时,会对第三方API执行一系列异步$http调用.

为了测试每个步骤至少被调用,我写了以下Jasmine规范.

茉莉花规格

ddescribe 'ExampleService',->

    beforeEach ->
        module 'myApp'

    beforeEach inject ($rootScope,$injector) ->
        @scope = $rootScope.$new()
        @exampleService = $injector.get 'exampleService'
        @q = $injector.get '$q'

    describe 'process example steps',->
        beforeEach  -> 
            @exampleService.attachScopeMethod(@scope)

        it "should attach the scope method",->
            expect(@scope.callSteps).toBeDefined()

        describe 'when called should invoke the promise chain',->

        it "should call step1 and step2",->
            defer = @q.defer()
            @exampleService.step1 = jasmine.createSpy('step1').andReturn(defer.promise)

            @exampleService.step2 = jasmine.createSpy('step2')

            @scope.callSteps()
            defer.resolve()

            expect(@exampleService.step1).toHaveBeenCalled()
            expect(@exampleService.step2).toHaveBeenCalled()

该测试的结果如下：

> expect(@ exampleService.step1).toHaveBeenCalled() – PASS
> expect(@ exampleService.step2).toHaveBeenCalled() – 失败

你能告诉我如何让step2()在测试中成功运行吗？

谢谢

编辑

@Dashu以下提供了问题的答案.诀窍是简单地调用scope.$apply或scope.$digest来触发promise链解析.

所以这是工作测试片段.

describe 'when called should invoke the promise chain',->
    it "should call step1 and step2",->
        defer = @q.defer()
        defer.resolve()

        @exampleService.step1 = jasmine.createSpy('step1').andReturn(defer.promise)
        @exampleService.step2 = jasmine.createSpy('step2')

        @scope.callSteps()
        @scope.$apply()

        expect(@exampleService.step1).toHaveBeenCalled()
        expect(@exampleService.step2).toHaveBeenCalled()