Javascript Jasmine:用事件测试可观测值
我正在尝试测试angular2应用程序。我有一个登录表单,它使用一个observable将数据发送到后端:Javascript Jasmine:用事件测试可观测值,javascript,testing,typescript,jasmine,angular,Javascript,Testing,Typescript,Jasmine,Angular,我正在尝试测试angular2应用程序。我有一个登录表单,它使用一个observable将数据发送到后端: doLogin() { this.usersService.login(this.model) .subscribe((data) => { console.log("In observable: " + data.isSuccess); if (!data.isSuccess) {
doLogin() {
this.usersService.login(this.model)
.subscribe((data) => {
console.log("In observable: " + data.isSuccess);
if (!data.isSuccess) {
this.alerts.push({});
}
});
}
在测试中,我在服务函数上添加了一个spy,它返回observable,以便组件可以处理它:
usersService.login.and.returnValue(Observable.of(
<LoginResponse>{
isSuccess: true
}));
它工作正常。不幸的是,当我检查测试中是否调用了usersService.login时:
expect(usersService.login).toHaveBeenCalled();
我得到一个错误,因为observable没有完成,登录还没有被调用
我应该如何确保,我检查我的间谍后,observable已经完成 我不知道您如何在组件上配置服务,但当我覆盖从
TestComponentBuilder
创建的组件的提供程序时,它对我有效
我们来取样吧。我有一个返回字符串列表的服务:
import {Observable} from 'rxjs/Rx';
export class MyService {
getDogs() {
return Observable.of([ 's1', 's2', ... ]);
}
}
组件使用此服务在单击按钮时异步显示列表:
@Component({
selector: 'my-list',
providers: [MyService],
template: `
<ul><li *ngFor="#item of items">{{ item }}</li></ul>
<div id="test" (click)="test()">Test</div>
`
})
export class MyList implements OnInit {
items:Array<string>;
service:MyService;
constructor(private service:MyService) {
}
test() {
this.service.getDogs().subscribe(
(dogs) => {
this.items = dogs;
});
}
}
编辑
由于异步触发事件,可以考虑使用<代码> FAKAASYNC 。后者允许您完全控制何时处理异步处理,并将异步事务转换为同步事务
您可以将测试处理包装到fakeAsync((): void => {
var clickButton = document.getElementById('test');
clickButton.dispatchEvent(new Event("click"));
expect(service.getDogs).toHaveBeenCalled();
});
有关更多详细信息,您可以查看以下问题:
let service:MyService = new MyService();
beforeEach(() => {
spyOn(service, 'getDogs').and.returnValue(Observable.of(
['dog1', 'dog2', 'dog3']));
});
it('should test get dogs', injectAsync([TestComponentBuilder], (tcb: TestComponentBuilder) => {
return tcb.overrideProviders(MyList, [provide(MyService, { useValue: service })])
.createAsync(MyList).then((componentFixture: ComponentFixture) => {
const element = componentFixture.nativeElement;
componentFixture.detectChanges();
var clickButton = document.getElementById('test');
clickButton.dispatchEvent(new Event("click"));
expect(service.getDogs).toHaveBeenCalled();
});
}));
fakeAsync((): void => {
var clickButton = document.getElementById('test');
clickButton.dispatchEvent(new Event("click"));
expect(service.getDogs).toHaveBeenCalled();
});