Aurelia:单位测试事件聚合器

Question

作为角(2(开发人员，我最近开始尝试Aurelia。顺便说一句。但是我确实遇到了一些困难，单位测试了Aurelia的Event Aggregator。这就是我目前的目前，但现在并没有在控制器中启动该事件。我现在做错了，有些帮助会很棒！

// app.js
@inject(UserService, EventAggregator)
export class App {
    constructor(userService, eventAggregator) {
        this.userService = userService;
        this.eventAggregator = eventAggregator;
        this.authorizedUser = null;
        // get authorized user
        this.getAuthorizedUser();
        // subscribe to events
        this.eventAggregator.subscribe(EVENTS.USER_LOGGED_IN, data => {
            this.authorizedUser = data;
        });
    }
    // calls userService and sets this.authorizedUser;
    getAuthorizedUser() {
        ....
    }
 }

和我的规格当前看起来像这样：

describe('app', () => {
    let component,
        createComponent,
        eventAggregator = new EventAggregator(),
        userService = new UserService();
    beforeEach(() => {    
        component = StageComponent.withResources('app').inView('<app></app>');
        component.bootstrap(aurelia => {
            aurelia.use.standardConfiguration();
            aurelia.container.registerInstance(UserService, userService);
            aurelia.container.registerInstance(EventAggregator, eventAggregator);
        });
        createComponent = component.create(bootstrap);
    });
    // this one is working for example..
    it('should get authorized user when token is set', (done) => {
        const result = 'some value';
        spyOn(UserService, 'getToken').and.returnValue(true);
        spyOn(userService, 'getAuthorizedUser').and.returnValue(Promise.resolve('some value'));
        createComponent.then(() => {
            const viewModel = component.viewModel;
            expect(viewModel.authorizedUser).toEqual(result);
            done();
        });
    });
    // this one is failing (depending on Event Aggregator)
    it('should set authorized user when LOGGED_IN event is fired', (done) => {
        spyOn(UserService, 'getToken').and.returnValue(false);
        createComponent.then(() => {
            const viewModel = component.viewModel;
            expect(viewModel.authorizedUser).toEqual(null);
            eventAggregator.publish(EVENTS.USER_LOGGED_IN, 'some value');
            expect(viewModel.authorizedUser).toEqual('some value');
            done();
        });
    });
    afterEach(() => {
        component.dispose();
    });

});

Answer 1

因此，经过一定的反复试验，我发现了如何对上述代码进行单位测试。它并不是真正遵循Aurelia的文档，但我实际上对这种测试方式感到非常满意。希望这可以对你们中的一些人有所帮助。不知道这是正确的方法，但对我有用。请评论您的想法..

describe('app', () => {
    let sut,
        userServiceMock,
        eventAggregator;
    beforeEach(() => {
        userServiceMock = new UserServiceMock(); // use a mock for the original service
        eventAggregator = new EventAggregator();
        sut = new App(userServiceMock, eventAggregator);
    });
    describe('subscribing to events', () => {
        it('should set authorized user when LOGGED_IN event is fired', done => {
            const authUser = {someKey: 'someValue'};
            // expect initial values
            expect(sut.authorizedUser).toEqual(null);
            // publish an event     
            eventAggregator.publish(EVENTS.USER_LOGGED_IN, authUser);
                                 // ^ this is just a string constant
            // expect the values changes triggered by the event
            expect(sut.authorizedUser).toEqual(authUser);
            done();
        });
    });
    afterEach(() => {
        // sut.dispose() doesn't work here, still need to figure this out
    });
});