ember.js - 实例初始值设定项单元测试失败，错误代码为 "store is undefined"

Question

生成示例应用程序后:

ember new preloadtest
cd preloadtest/
ember g instance-initializer preload
ember g model test-data
ember g route index
ember g adapter application

包含以下文件:

models/test-data.js

import DS from 'ember-data';

export default DS.Model.extend({
  name: DS.attr('string'),
  value: DS.attr( 'number' )
});

routes/index.js

import Ember from 'ember';

export default Ember.Route.extend({
  model(){
    return this.store.peekAll( 'test-data' );
  }
});

instance-initializers/preload.js

export function initialize( appInstance ) {
  let store = appInstance.lookup( 'service:store' );
  store.pushPayload( { "testDatas": [
    { "id": 1, "name": "aaa", "value": 1},
    { "id": 2, "name": "bbb", "value": 2},
    { "id": 3, "name": "ccc", "value": 3}
  ] } );
}

export default {
  name: 'preload',
  initialize
};

templates/index.hbs

<ul>
{{#each model as |td|}}
  <li>{{td.name}}: {{td.value}}</li>
{{/each}}
</ul>

适配器/application.js

import RESTAdapter from 'ember-data/adapters/rest';

export default RESTAdapter.extend({});

emberserve 运行应用程序并显示预加载数据，但转到 /tests 时，preload 实例初始值设定项的默认单元测试失败，并显示错误存储未定义。

完整错误消息:

Died on test #1 @http://localhost:4200/assets/tests.js:212:1
Module.prototype.exports@http://localhost:4200/assets/vendor.js:94:20
Module.prototype.build@http://localhost:4200/assets/vendor.js:142:5
findModule@http://localhost:4200/assets/vendor.js:193:5
requireModule@http://localhost:4200/assets/vendor.js:181:12
TestLoader.prototype.require@http://localhost:4200/assets/test-loader.js:67:9
TestLoader.prototype.loadModules@http://localhost:4200/assets/test-loader.js:58:13
TestLoader.load@http://localhost:4200/assets/test-loader.js:89:7
@http://localhost:4200/assets/test-support.js:6397:5
: store is undefined@ 114 ms
Source:     

initialize@http://localhost:4200/assets/preloadtest.js:213:5
@http://localhost:4200/assets/tests.js:213:1
runTest@http://localhost:4200/assets/test-support.js:2716:14
Test.prototype.run@http://localhost:4200/assets/test-support.js:2701:4
run/<@http://localhost:4200/assets/test-support.js:2843:6
process@http://localhost:4200/assets/test-support.js:2502:4
begin@http://localhost:4200/assets/test-support.js:2484:2
resumeProcessing/<@http://localhost:4200/assets/test-support.js:2544:4

如何初始化应用程序的存储以便可以在单元测试中使用它？

编辑-tests/unit/instance-initializers/preload-test.js

import Ember from 'ember';
import { initialize } from 'preloadtest/instance-initializers/preload';
import { module, test } from 'qunit';
import destroyApp from '../../helpers/destroy-app';
//import DS from 'ember-data';

module('Unit | Instance Initializer | preload', {
  //needs: [ 'service:store' ],
  beforeEach: function() {
    Ember.run(() => {
      this.application = Ember.Application.create();
      this.appInstance = this.application.buildInstance();
    });
  },
  afterEach: function() {
    Ember.run(this.appInstance, 'destroy');
    destroyApp(this.application);
  }
});

// Replace this with your real tests.
test('it works', function(assert) {
  initialize(this.appInstance);

  // you would normally confirm the results of the initializer here
  assert.ok(true);
});

尝试使用 needs: [ 'service:store' ] 和不使用(尽管它建议您 should not need to do this 如果 Ember-Data 位于页面上 - 我也尝试过导入两者在单元测试和实例初始化程序中)。

版本:

Ember      : 2.4.5
Ember Data : 2.5.2

Answer 1

在实例初始化程序的单元测试中，您不需要获取真正的store服务。在这种情况下，最好使用模拟服务。实例初始化程序的行为是将一些数据放入应用程序提供的存储中。您可以轻松模拟该商店。

使用模拟服务的示例测试代码:

import Ember from 'ember';
import { initialize } from 'preloadtest/instance-initializers/preload';
import { module, test } from 'qunit';
import destroyApp from '../../helpers/destroy-app';

//this is the mock store service:
const storeStubFactory  = Ember.Service.extend({
  data: null,
  init(){
    this.data = [];
  },
  pushPayload(payload){
      this.get('data').pushObject(payload); 
  },
  getAllPayloads(){
      return this.get('data');
  }
});

module('Unit | Instance Initializer | preload', {
  beforeEach: function() {
    Ember.run(() => {
      this.application = Ember.Application.create();
      this.appInstance = this.application.buildInstance();
      //Register your mock service (do not  create instance, use factory)
      this.appInstance.register('service:store', storeStubFactory);
    });
  },
  afterEach: function() {
    Ember.run(this.appInstance, 'destroy');
    destroyApp(this.application);
  }
});

// This is your real test:
test('it works', function(assert) {
  initialize(this.appInstance);

  // confirm that mock service has the correct payload:      
  assert.ok(this.appInstance.lookup('service:store').getAllPayloads());
});

第二个选项

当然你也可以模拟initialize函数的appInstance参数，如下:

import Ember from 'ember';
import { initialize } from 'preloadtest/instance-initializers/preload';
import { module, test } from 'qunit';
import destroyApp from '../../helpers/destroy-app';

const storeStubFactory  = Ember.Service.extend({
  data: null,
  init(){
    this.data = [];
  },
  pushPayload(payload){
      this.get('data').pushObject(payload); 
  },
  getAllPayloads(){
      return this.get('data');
  }
});

module('Unit | Instance Initializer | preload');

// This is your real test:
test('it works', function(assert) {
  let instance = storeStubFactory.create();

  initialize({lookup:function(serviceName){return serviceName==='service:store' ? instance : null;}}); 

  // confirm that mock service has the correct payload:   
  assert.ok(instance.getAllPayloads());
});

但我更喜欢使用第一个。我们指出，您的实例初始化程序的行为是将一些数据放入应用程序提供的存储中。但在第二个选项中，我们似乎也在检查您的实例初始化程序是否也在调用 appInstance 的查找函数。此测试与您的实现细节更加相关。