it('should unsubscribe from the previous "swap" observable when unsubscribed from', () => {
const obs = new ObservableWithSubscriptionSpies();
swapViewsSpy.and.returnValue(obs);
const renderObservable = docViewer.render({contents: 'Hello, world!', id: 'foo'});
const subscription = renderObservable.subscribe();
expect(obs.subscribeSpy).toHaveBeenCalledTimes(1);
expect(obs.unsubscribeSpies[0]).not.toHaveBeenCalled();
subscription.unsubscribe();
expect(obs.subscribeSpy).toHaveBeenCalledTimes(1);
expect(obs.unsubscribeSpies[0]).toHaveBeenCalledTimes(1);
});
const doRender = (contents: string | null, id = 'foo') =>
docViewer.render({contents, id}).toPromise();
it('should return an `Observable`', () => {
expect(docViewer.render({contents: '', id: ''})).toEqual(jasmine.any(Observable));
});
new Promise<void>((resolve, reject) =>
docViewer.render({contents, id}).subscribe(resolve, reject));