注射相关的服务时，单元测试AngularJS服务 [英] Injecting dependent services when unit testing AngularJS services

问题描述

我测试服务A，但是服务A依赖于服务B（即服务B被注入到服务A）。

I'm testing service A, but service A depends on service B (i.e. service B is injected into service A).

我见过这个问题但我的情况是不同的一点，因为在我看来，它更有意义模拟的服务B，而不是注射服务B的实际情况我会用茉莉间谍嘲笑它。

I've seen this question but my case is a bit different because in my opinion it makes more sense to mock service B instead of injecting an actual instance of service B. I'd mock it with a jasmine spy.

下面是一个样本测试：

describe("Sample Test Suite", function() {

  beforeEach(function() {

    module('moduleThatContainsServiceA');

    inject([
      'serviceA', function(service) {
        this.service = service;
      }
    ]);

  });

  it('can create an instance of the service', function() {
    expect(this.service).toBeDefined();
  });
});

我得到的错误是：

The error I get is:

错误：未知提供商：serviceBProvider

Error: Unknown provider: serviceBProvider

我怎么会做这样的事情？

How could I do something like this?

推荐答案

其实在AngularJS依赖注射使用'最后的胜的规则。所以，你可以包括你的模块和依赖关系确定后，在测试你的服务，然后当你正在测试将使用DI请求服务B的服务A，AngularJS将会给服务B的嘲笑版本。

Actually in AngularJS Dependency Injection uses the 'last wins' rule. So you can define your service in your test just after including your module and dependencies, and then when service A that you're testing will request service B using DI, AngularJS will give mocked version of service B.

这往往是通过定义像MyAppMocks新的模块完成，把嘲笑服务/价值那里，然后刚刚添加该模块作为依赖关系。

This is often is done by defining new module like MyAppMocks, putting mocked services/values there and then just adding this module as dependency.

的种类（示意图）：

beforeEach(function() {
  angular.module('MyAppMocks',[]).service('B', ...));
  angular.module('Test',['MyApp','MyAppMocks']);
  ...

这篇关于注射相关的服务时，单元测试AngularJS服务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！