rx-delay.test.js

// https://github.com/angular/angular/issues/10127#issuecomment-247873713

it('should run async test with successful delayed Observable', fakeAsync(() => {
    let actuallyDone = false;
    let currentTime = 0;

    spyOn(Scheduler.async, 'now').and.callFake(() => currentTime);

    let source = Observable.of(true).delay(10);
    source.subscribe(() => {
        actuallyDone = true;
    });

    currentTime = 10;
    tick(10);

    expect(actuallyDone).toEqual(true);
}));