实例初始值设定项单元测试失败并显示“存储未定义”

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

具有以下文件：

模型/测试数据.js

import DS from 'ember-data';

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

路线/index.js

import Ember from 'ember';

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

实例初始化器/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
};

模板/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({});

ember serve运行应用程序并显示预加载数据，但要/tests默认的单元测试preload实例初始化程序失败并出现错误store is undefined.

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);
});

尝试过needs: [ 'service:store' ]和没有（虽然它建议你不需要这样做 https://github.com/emberjs/data/issues/2994#issuecomment-99615466如果 Ember-Data 在页面上 - 我也尝试在单元测试和实例初始化程序中导入）。

Versions:

Ember      : 2.4.5
Ember Data : 2.5.2

在实例初始化程序的单元测试中，您不需要真正了解store服务。在这种情况下，最好使用模拟服务。您的实例初始化程序的行为是将一些数据存储到应用程序提供的存储中。你可以轻松地嘲笑那家商店。

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

当然你也可以嘲笑appInstance的参数initialize功能如下：

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行为为将一些数据存储到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是调用appInstance的查找函数也。该测试与您的实现细节更加相关。