Angular 为什么';异步角度单元测试是否找到DOM元素?
我有一个失败的异步角度组件DOM测试,但它的同步等价物失败了,我不明白为什么 这是茉莉花测试:Angular 为什么';异步角度单元测试是否找到DOM元素?,angular,unit-testing,asynchronous,jasmine,angular-calendar,Angular,Unit Testing,Asynchronous,Jasmine,Angular Calendar,我有一个失败的异步角度组件DOM测试,但它的同步等价物失败了,我不明白为什么 这是茉莉花测试: describe('Availability Component', () => { let fixture: ComponentFixture<AvailabilityComponent>; const absenceService = jasmine.createSpyObj('AbsenceService', ['findAbsences']); a
describe('Availability Component', () => {
let fixture: ComponentFixture<AvailabilityComponent>;
const absenceService = jasmine.createSpyObj('AbsenceService', ['findAbsences']);
absenceService.findAbsences.and.returnValue(of([{}]));
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [AvailabilityComponent],
imports: [CalendarModule.forRoot()],
providers: [{provide: AbsenceService, useValue: absenceService}]
}).compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(AvailabilityComponent);
});
const printAbsenceReasons = function () {
console.log(fixture.debugElement.queryAll(By.css('.calendarAbsence'))
.map(e => e.nativeElement.textContent)
.join(','));
};
it('should synchronously find absences in calendar view', () => {
fixture.detectChanges();
console.log('synchronous test');
printAbsenceReasons();
});
it('should asynchronously find absences in calendar view', fakeAsync(() => {
fixture.detectChanges();
tick();
fixture.detectChanges();
tick();
console.log('asynchronous test');
printAbsenceReasons();
}));
});
我不确定这是否与我正在使用的组件有关,或者这是否是我的测试代码的一个更基本的问题
以下是我的组件、模板和服务代码供参考:
@Component({
selector: 'app-availability',
templateUrl: './availability.component.html',
styleUrls: ['availability.component.scss']
})
export class AvailabilityComponent implements OnInit {
viewDate: Date = new Date();
absenceEvents: CalendarEvent[] = [];
constructor(private absenceService: AbsenceService) {
}
ngOnInit() {
this.getAbsences();
}
getAbsences() {
this.absenceService.findAbsences()
.subscribe(ignored => {
console.log('processing absences');
this.absenceEvents = [{
start: new Date(2018, 3, 29), title: 'A'
}];
});
}
getAbsence(events: CalendarEvent[]) {
return events[0] ? events[0].title : '';
}
}
@Injectable()
export class AbsenceService {
private url = environment.APP_SHIFT_SERVICE_BASE_URL + '/api/absences';
constructor(private http: HttpClient) {
}
findAbsences(): Observable<Absence[]> {
console.error('Actual findAbsences() called');
return this.http.get<Absence[]>(this.url);
}
}
模板代码:
<div>
<div>
<mwl-calendar-month-view
[viewDate]="viewDate"
[events]="absenceEvents"
[cellTemplate]="availabilityCellTemplate">
</mwl-calendar-month-view>
</div>
<ng-template #availabilityCellTemplate let-day="day">
<div class="calendarAbsence">{{ getAbsence(day.events) }}</div>
</ng-template>
</div>
{{get缺席(day.events)}
服务代码:
@Component({
selector: 'app-availability',
templateUrl: './availability.component.html',
styleUrls: ['availability.component.scss']
})
export class AvailabilityComponent implements OnInit {
viewDate: Date = new Date();
absenceEvents: CalendarEvent[] = [];
constructor(private absenceService: AbsenceService) {
}
ngOnInit() {
this.getAbsences();
}
getAbsences() {
this.absenceService.findAbsences()
.subscribe(ignored => {
console.log('processing absences');
this.absenceEvents = [{
start: new Date(2018, 3, 29), title: 'A'
}];
});
}
getAbsence(events: CalendarEvent[]) {
return events[0] ? events[0].title : '';
}
}
@Injectable()
export class AbsenceService {
private url = environment.APP_SHIFT_SERVICE_BASE_URL + '/api/absences';
constructor(private http: HttpClient) {
}
findAbsences(): Observable<Absence[]> {
console.error('Actual findAbsences() called');
return this.http.get<Absence[]>(this.url);
}
}
@Injectable()
导出类缺勤服务{
private url=environment.APP_SHIFT_SERVICE_BASE_url+'/api/absences';
构造函数(专用http:HttpClient){
}
findabsenses():可观察{
error('Actual findabsenses()'called');
返回this.http.get(this.url);
}
}
我很确定这不起作用的原因是因为您如何定义了间谍。它在每个块之前的之外定义
按照现在的方式,当装置启动时,间谍会被创建一次。茉莉花的工作原理是在每次测试结束时清除所有的老间谍。因此,通过第二次测试,你的间谍不再存在
我敢打赌,如果您切换了测试顺序,那么您将看到异步测试工作,而同步测试不工作
要修复此问题,只需将其移动到beforeach块中:
const absenceService = jasmine.createSpyObj('AbsenceService', ['findAbsences']);
absenceService.findAbsences.and.returnValue(of([{}]));
不幸的是,这似乎与fakeAsync区域有关,而与异步测试无关
我已经设法让一个工作异步测试使用async
而不是fakeAsync
:
it('should asynchronously find absences in calendar view', async(() => {
fixture.detectChanges();
fixture.whenStable().then(() => {
console.log('asynchronous test');
printAbsenceReasons(fixture);
expect(getAbsenceElements(fixture).length).toEqual(35);
});
});
}));
我调试了失败的fakeAsync
和成功的同步测试。它们都将库中名为getMonthView
的方法称为“calendar utils”,由同一作者命名为“angular calendar”:
在这种情况下,日期参数和其他日期计算本身似乎都出错了
目前我只能假设它与此相关。我在Angular 5.2上,但我认为它仍然相关。无论如何,我确信我的测试代码基本上是正确的,但问题出在别处。这很有道理,但当我对同步测试进行注释时,我仍然看到异步测试的相同结果为“”。令人惊讶的是,一个async
而不是fakeAsync
测试实际上是有效的:async(()=>{fixture.detectChanges();fixture.whenStable()。然后(()=>printAbscenceReasons())