问题
After generating an example application:
ember new preloadtest
cd preloadtest/
ember g instance-initializer preload
ember g model test-data
ember g route index
ember g adapter application
With the following files:
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>
adapters/application.js
import RESTAdapter from 'ember-data/adapters/rest';
export default RESTAdapter.extend({});
ember serve runs the application and displays the preload data but going to /tests the default unit test for the preload instance initializer fails with the error store is undefined.
Full Error Message:
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
How do I initialize the application's store so that it can be used in the unit test?
Edit - 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);
});
Tried it with needs: [ 'service:store' ] and without (although its suggested that you should not need to do this if Ember-Data is on the page - which I've also tried importing both in the unit test and in the instance initialiser).
Versions:
Ember : 2.4.5
Ember Data : 2.5.2
回答1:
At Unit test of an instance-initializer, you don't need to get real store service. In such cases, prefer using mock services. The behaviour of your instance-initializer is to put some data to the store which is provided by application. You can easily mock that store.
Example test code with mock service:
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());
});
Second option
Of course you can also mock the appInstance paramater of the initialize function as below:
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());
});
But I prefer to use first one. We stated that your instance-initializers behaviour as to put some data to the store which is provided by application. But in second option, it seems that we are also checking that your instance-initializer is calling the lookup function of appInstance too. This test is more coupled to your implementation detail.
来源：https://stackoverflow.com/questions/36731207/instance-initializer-unit-test-fails-with-store-is-undefined