Angular test with `async` causing Jasmine timeout?

问题

I recently upgraded a project to Angular 6, and now tests that were working fine before are now failing. Here's an example of one of those tests:

  beforeEach(
    async(() => {
      TestBed.configureTestingModule({
        declarations: [CampaignsDetailScheduleComponent],
        imports: [
          SomeModule,
          ReactiveFormsModule,
          TranslateModule.forRoot({
            loader: { provide: TranslateLoader, useClass: TranslateFakeLoader }
          }),
          StoreModule.forRoot({})
        ],
        providers: [{ provide: ConfigService, useValue: ConfigServiceMock }],
        schemas: [NO_ERRORS_SCHEMA]
      });
      fixture = TestBed.createComponent(CampaignsDetailScheduleComponent);
      comp = fixture.componentInstance; // Component test instance
      _store = fixture.debugElement.injector.get<Store<State>>(Store);
      comp.campaignModel$ = of(CampaignMockData);
      fixture.detectChanges();
    })
  );

it(
    'close edit schedule modal',
    async(() => {
      spyOn(_store, 'dispatch');
      comp.onClose();
      const args = new ShowHideEditScheduleModal(false);
      expect(_store.dispatch).toHaveBeenCalledWith(args);
    })
  );

Pre-Angular 6, this test passed with no issues. But now under Angular 6, I get the error:

Error: Timeout - Async callback was not invoked within timeout specified by jasmine.DEFAULT_TIMEOUT_INTERVAL.--Pendng async tasks are: [type: macroTask, source: setInterval, args: {handleId:4072,isPeriodic:true,delay:0,args:[object Arguments],__creationTrace__:[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]},type: macroTask, source: setInterval, args: {handleId:4075,isPeriodic:true,delay:0,args:[object Arguments],__creationTrace__:[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]}]

Does anyone have any idea what might be going on?

回答1:

use fakeAsync instead of async in before each block.

回答2:

You can either increase the default jasmine timeout (which is 5s) interval by doing

it(
    'close edit schedule modal',
    async(() => {
      spyOn(_store, 'dispatch');
      comp.onClose();
      const args = new ShowHideEditScheduleModal(false);
      expect(_store.dispatch).toHaveBeenCalledWith(args);
   // increase default timeout interval to 10s
}), 10000);

OR you can solve it using done() method. Adding this will wait for your test to complete. I guess you cannot use async while using done()

it('close edit schedule modal', (done) => {
          spyOn(_store, 'dispatch');
          comp.onClose();
          const args = new ShowHideEditScheduleModal(false);
          expect(_store.dispatch).toHaveBeenCalledWith(args);
          done();
       // increase default timeout interval to 10s
 }, 10000);

来源：https://stackoverflow.com/questions/50747446/angular-test-with-async-causing-jasmine-timeout

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