Angular 4 单元测试中的模拟空闲

Question

我正在尝试使用 karma 为 Angular4 应用程序编写单元测试 在此之后我在TestBed.createComponent(ServicesComponent) 收到错误，所以没有一个测试用例被执行，并且

TypeError: this.expiry.last is not a function at Idle.Array.concat.Idle.watch...

在构造函数中写了很多东西（其中进行了服务调用并且还编写了空闲功能），应该如何编写测试用例？

这是我的规范文件，组件的构造函数中使用了空闲函数，我必须添加IdleExpiry、Keepalive 提供程序，以免出现Error: No provider for IdleExpiry 之类的异常

beforeEach(async(() => {
        TestBed.configureTestingModule({
            declarations: [                    
                ServicesComponent
            ],
            providers: [
                { provide: ServicesService, useClass: ServicesService },
                { provide: LocalStorageService, useClass: MockLocalStorageService },
                { provide: ServiceUtilities, useClass: ServiceUtilities },
                { provide: Idle, useClass: Idle },
                { provide: IdleExpiry, useClass: IdleExpiry },
                { provide: Keepalive, useClass: Keepalive },
                { provide: Router, useValue: routerStub },
                { provide: ActivatedRoute, useValue: activatedrouteStub },
                MockBackend,
                BaseRequestOptions,
                {
                    provide: Http,
                    useFactory: (backend, options) => new Http(backend, options),
                    deps: [MockBackend, BaseRequestOptions]
                }
            ],
            imports: [
                ModalModule.forRoot()
            ]
        }).compileComponents();
    }));
beforeEach(() => {            
        fixture = TestBed.createComponent(ServicesComponent);
        component = fixture.componentInstance;
        fixture.detectChanges();
    });

组件（不包括不必要的细节（替换为...））

export class ServicesComponent {
    ...
    approxWaitingTime: string;
    idleState = 'Not started.';
  timedOut = false;
  lastPing?: Date = null;
@ViewChild('autoShownModal') public autoShownModal: ModalDirective;
public isModalShown:boolean = false;
timer: any;
constructor(private servicesService: ServicesService, private route: ActivatedRoute, private router: Router, private idle: Idle, private keepalive: Keepalive) {

    this.servicesService.getServices(this.centerId).subscribe(data => { ... });
    this.servicesService.getCategories(this.centerId).subscribe(data => {  ... });
    this.servicesService.getStylists(this.centerId).subscribe(data => { ... });
    this.servicesService.getApproxWaitingTime(this.centerId).subscribe(data => { ... });

    this.route.queryParams.subscribe(params => { ... });

    // sets an idle timeout of 120 seconds, for testing purposes.
    idle.setIdle(10);
    // sets a timeout period of 30 seconds. after 30 seconds of inactivity, the user will be considered timed out.
    idle.setTimeout(5);
    // sets the default interrupts, in this case, things like clicks, scrolls, touches to the document
    idle.setInterrupts(DEFAULT_INTERRUPTSOURCES);

    idle.onIdleEnd.subscribe(() => this.idleState = 'No longer idle.');
    idle.onTimeout.subscribe(() => {
        console.log("ontimeout");
        this.idleState = 'Timed out!';
        this.timedOut = true;
    });
    idle.onIdleStart.subscribe(() => this.idleState = 'You\'ve gone idle!');
    idle.onTimeoutWarning.subscribe((countdown, router, autoShownModal) => {
        console.log("time out" + countdown);
        this.isModalShown = true;
        this.timer = setTimeout(function () { if (this.isModalShown) { this.hideModal(); } this.reset(); this.router.navigate(['']); }.bind(this), 3000);
        this.reset();
    });

    // sets the ping interval to 15 seconds
    keepalive.interval(10);

    keepalive.onPing.subscribe(() => { this.lastPing = new Date(); console.log('Keepalive.ping() called!'); });

    this.reset();
}
...

我错过了什么吗？

Answer 1

这是我为加载组件所做的操作，Mocked IdleExpiry

export class MockExpiry extends IdleExpiry {
  public lastDate: Date;
  public mockNow: Date;

  last(value?: Date): Date {
    if (value !== void 0) {
      this.lastDate = value;
    }

    return this.lastDate;
  }

  now(): Date {
    return this.mockNow || new Date();
  }
}

更新了规范

providers: [
...
    { provide: IdleExpiry, useClass: MockExpiry },
...
],

Answer 2

正确的解决方案是将 NgIdleKeepaliveModule 添加到 testingModule 的 imports。

我还建议不要扩展您在模拟中模拟的类（不过，实现并不是一个坏主意）。