使用 AngularJS、CoffeeScript 和 Jasmine(在 WebStorm 中编辑),我想对一系列 Promise 进行单元测试。
假设我有以下示例服务:
角服务
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
该服务允许我将方法附加callSteps()
到范围。此方法在调用时会执行一系列对第 3 方 API 的异步 $http 调用。
为了测试至少调用了每个步骤,我编写了以下 Jasmine 规范。
茉莉花规格
ddescribe 'ExampleService', ->
beforeEach ->
module 'myApp'
beforeEach inject ($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()
本次测试结果如下:
- 期望(@exampleService.step1).toHaveBeenCalled() -通过
- 期望(@exampleService.step2).toHaveBeenCalled() -失败
你能告诉我如何才能step2()
成功地在测试中运行吗?
谢谢
编辑
@Dashu 下面请提供问题的答案。诀窍是简单地调用scope.$apply
或scope.$digest
触发承诺链解析。
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()