我有一个 Angular 服务方法,它使用另一个服务进行 api 调用。在调用成功和订阅内部之后,我调用了一些方法,例如notifySucess,发出新值...
我的问题是如何测试订阅中的代码块,例如期望 notifySucess 已被调用。我在订阅中设置了一个断点,但代码执行并没有就此停止。
对于测试组件,我知道需要应用“fixture.detectChanges()”方法。对于服务测试,有没有类似的机制?
resource.service.ts
@Injectable({
providedIn: 'root',
})
export class ResourceService {
constructor(
private http: HttpClient,
) {}
putData(newData: Data): Observable<Data> {
return this.http.put<Data>('/api/put-endpoint', newData);
}
}
store.service.ts
@Injectable({
providedIn: 'root',
})
export class StoreService {
constructor(
private resource: ResourceService,
private notificationService: NotificationService,
)
saveChanges(newData: Data) {
this.resourceServie.putData(newData).subscribe(() => {
this.notificationService.notifySuccess('Save changes successfully');
// do something else
}
}
store.service.spec.ts
describe('StoreService', () => {
let storeService: StoreService;
let resourceService: jasmine.SpyObj<ResourceService>;
let notificationService: jasmine.SpyObj<NotificationService>;
notificationService = jasmine.createSpyObj('NotificationService', ['notifySuccess']);
resourceService = jasmine.createSpyObj('ResourceService', ['putData']);
beforeEach(() => {
TestBed.configureTestingModule({
providers: [
{ provide: ResourceService, useValue: resourceService },
{
provide: NotificationService,
useValue: notificationService,
},
],
});
});
it('should saveChanges', () => {
const newData: Data = {foo: bar};
resourceService.putData.and.returnValue(of(newData));
storeService.putData(newData);
expect(resourceService.putData).toHaveBeenCalledWith(newData); // PASS
expect(notificationService.notifySuccess).toHaveBeenCalledWith(Save changes successfully); // FAIL as the code block inside the subscription does not run
});
})
答案 0 :(得分:0)
您的间谍需要返回一些触发订阅的值。 您可以阅读有关间谍的更多高级信息here 您需要使用:
const newData: Data = {foo: bar};
resourceService = spyOn(resourceService,'putData').and.returnValue(newData);
代替:
resourceService = jasmine.createSpyObj('ResourceService', ['putData']);
你也可以看到类似的帖子 - Angular - unit test for a subscribe function in a component
尝试以这种方式实现 store.service.spec.ts:
describe('StoreService', () => {
let storeService: StoreService;
let resourceService: ResourceService;
let notificationService: NotificationService;
const newData: Data = {foo: bar};
resourceService = spyOn(resourceService,'putData').and.returnValue(newData);
resourceService = spyOn(notificationService,'notifySuccess').and.returnValue('Save changes successfully');
beforeEach(() => {
TestBed.configureTestingModule({
providers: [],
});
resourceService= TestBed.inject(ResourceService);
notificationService= TestBed.inject(NotificationService);
storeService = TestBed.inject(storeService);
});
it('should saveChanges', () => {
storeService.saveChanges(newData);
expect(resourceService.putData).toHaveBeenCalledWith(newData);
expect(notificationService.notifySuccess).toHaveBeenCalledWith(Save changes successfully); /
});
})