AngularJS:返回 $http 承诺的测试工厂 [英] AngularJS : Testing factory that returns $http promises

问题描述

尝试测试返回 $http GET 请求和 then 处理程序的 Angular 服务，但我无法测试该逻辑是否实际在then 函数.这是服务代码的基本截断版本:

Trying to test an angular service that returns an $http GET request and the then handler, but I'm not able to test that the logic actually works inside of the then function. Here is a basic, truncated version of the service code:

angular.module('app').factory('User', function ($http) {
  var User = {};

  User.get = function(id) {
    return $http.get('/api/users/' + id).then(function (response) {
      var user = response.data;
      user.customProperty = true;  
      return user;
    });
  };

  return User;
});

这里是测试:

beforeEach(module('app'));
beforeEach(inject(function(_User_, _$q_, _$httpBackend_, _$rootScope_) {
  $q = _$q_;
  User = _User_;
  $httpBackend = _$httpBackend_;
  $scope = _$rootScope_.$new();
}));

afterEach(function () {
  $httpBackend.verifyNoOutstandingRequest();
  $httpBackend.verifyNoOutstandingExpectation();
});

describe('User factory', function () {

  it('gets a user and updates customProperty', function () {
    $httpBackend.expectGET('/api/users/123').respond({ id: 123 });
    User.get(123).then(function (user) {
      expect(user.customProperty).toBe(true);  // this never runs
    });

    $httpBackend.flush();
  });

});

我觉得我已经尝试了几乎所有方法来测试 then 调用中的逻辑，所以如果有人能提供建议，我将不胜感激.

I feel like I've tried pretty much everything to test the logic in the then call, so if someone can offer suggestions I would greatly appreciate it.

我的问题也是由于非标准注入实践，所以下面的答案在此之外有效.

my problem was also due to nonstandard injection practices, so the answer below worked outside of that.

推荐答案

一些事情需要改变

• 使用 whenGET 而不是 expectGET 来伪造响应
• 在测试 then 回调中，将响应设置为回调外部可用的变量，以便您可以在 expect 调用中对其进行测试
• 确保 expect 调用在任何回调之外，以便它始终运行并显示任何失败.

• Use whenGET instead of expectGET in order to fake a response
• In the test then callback, set the response to a variable available outside the callback so you can test it in an expect call
• Make sure the expect call is outside any callbacks, so it always runs and shows any failures.

综合起来:

it('gets a user and updates customProperty', function () {
  $httpBackend.whenGET('/api/users/123').respond({ id: 123 });
  User.get(123).then(function(response) {
    user = response;
  })
  $httpBackend.flush();
  expect(user.customProperty).toBe(true); 
});

正如在 http://plnkr.co/edit/9zON7ALKnrKpcOVrBupQ?p=preview 中所见

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