在角度 e2e 测试中模拟 $httpBackend [英] mock $httpBackend in angular e2e tests

问题描述

有人知道如何在角度 e2e 测试中模拟 $httpBackend 吗?这个想法是在 travis-ci 上运行测试时存根 XHR 请求.我正在使用 karma 来代理我在 travis 上运行的 rails 应用程序的资产和部分.我想在没有真正的数据库查询的情况下进行验收测试.

Does anyone have an idea how to mock $httpBackend in angular e2e tests? The idea is stubbing XHR requests while running tests on travis-ci. I'm using karma to proxy assets and partials from my rails app running on travis. I want to do acceptance testing without real DB queries.

这是我的业力配置文件的一部分:

Here is part of my karma config file:

...
files = [
  MOCHA,
  MOCHA_ADAPTER,

  'spec/javascripts/support/angular-scenario.js',
  ANGULAR_SCENARIO_ADAPTER,

  'spec/javascripts/support/angular-mocks.js',
  'spec/javascripts/e2e/**/*_spec.*'
];
...

proxies = {
  '/app': 'http://localhost:3000/',
  '/assets': 'http://localhost:3000/assets/'
};
...

这是我的规范文件的一部分:

Here is part of my spec file:

beforeEach(inject(function($injector){
  browser().navigateTo('/app');
}));

it('should do smth', inject(function($rootScope, $injector){
  input('<model name>').enter('smth');
  //this is the point where I want to stub real http query
  pause();
}));

我尝试通过$injector接收$httpBackend服务:

I have tried to receive $httpBackend service through $injector:

$injector.get('$httpBackend')

但这不是在我的测试运行的 iframe 中使用的那个.

But this is not the one that is used inside iframe where my tests run.

我的下一个尝试是使用 angular.scenario.dsl，这里是代码示例:

The next try I made was using angular.scenario.dsl, here is code samle:

angular.scenario.dsl('mockHttpGet', function(){
  return function(path, fakeResponse){
    return this.addFutureAction("Mocking response", function($window, $document, done) {
      // I have access to window and document instances 
      // from iframe where my tests run here
      var $httpBackend =  $document.injector().get(['$httpBackend']);
      $httpBackend.expectGET(path).respond(fakeResponse)
      done(null);
    });
  };
});

使用示例:

it('should do smth', inject(function($rootScope, $injector){
  mockHttpGet('<path>', { /* fake data */ });
  input('search.name').enter('mow');
  pause();
}));

这会导致以下错误:

<$httpBackend listing>  has no method 'expectGET'

所以，在这一点上，我不知道下一步.有没有人尝试过这样做，这种类型的存根真的可能吗?

So, at this point I have no idea of next step. Have anyone tried doing something like this, is this type of stubbing really possible?

推荐答案

如果你真的想在端到端测试中模拟后端(这些测试称为场景，而规格用于单元测试)，那么这就是我在一个我之前正在做的项目中做过.

If you are really trying to mock out the backend in a E2E test (these tests are called Scenarios, while Specs are used for unit testing) then this is what I did in a project I was working on earlier.

我正在测试的应用程序名为 studentsApp.这是一个通过查询 REST api 来搜索学生的应用程序.我想在不实际查询该 api 的情况下测试应用程序.

The application I was testing was called studentsApp. It was an application to search for students by querying a REST api. I wanted to test the application without actually querying that api.

我创建了一个名为 studentsAppDev 的 E2E 应用程序，我将 studentsApp 和 ngMockE2E 注入其中.在那里，我定义了 mockBackend 应该期待什么调用以及返回什么数据.以下是我的 studentsAppDev 文件的示例:

I created a E2E application called studentsAppDev that I inject studentsApp and ngMockE2E into. There I define what calls the mockBackend should expect and what data to return. The following is an example of my studentsAppDev file:

"use strict";

// This application is to mock out the backend. 
var studentsAppDev = angular.module('studentsAppDev', ['studentsApp', 'ngMockE2E']);
studentsAppDev.run(function ($httpBackend) {

    // Allow all calls not to the API to pass through normally
    $httpBackend.whenGET('students/index.html').passThrough();

    var baseApiUrl = 'http://localhost:19357/api/v1/';
    var axelStudent = {
        Education: [{...}],
        Person: {...}
    };
    var femaleStudent = {
        Education: [{...}],
        Person: {...}
    };
    $httpBackend.whenGET(baseApiUrl + 'students/?searchString=axe&')
        .respond([axelStudent, femaleStudent]);
    $httpBackend.whenGET(baseApiUrl + 'students/?searchString=axel&')    
        .respond([axelStudent, femaleStudent]);
    $httpBackend.whenGET(baseApiUrl + 'students/?searchString=axe&department=1&')
        .respond([axelStudent]);
    $httpBackend.whenGET(baseApiUrl + 'students/?searchString=axe&department=2&')
        .respond([femaleStudent]);
    $httpBackend.whenGET(baseApiUrl + 'students/?searchString=axe&department=3&')    
        .respond([]);

    ...

    $httpBackend.whenGET(baseApiUrl + 'departments/?teachingOnly=true')
        .respond([...]);
    $httpBackend.whenGET(baseApiUrl + 'majors?organization=RU').respond([...]);
});

然后，我在我的 Jenkins CI 服务器中迈出了第一步，将 studentsApp 替换为 studentsAppDev 并添加对 angular-mocks.js 的引用code> 在主 index.html 文件中.

Then, I have a first step in my Jenkins CI server to replace the studentsApp with studentsAppDev and add a reference to angular-mocks.js in the main index.html file.

这篇关于在角度 e2e 测试中模拟 $httpBackend的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！