it('should show last quote (quote done)', (done: DoneFn) => {
  fixture.detectChanges();

  component.quote.pipe( last() ).subscribe(() => {
    fixture.detectChanges(); // update view with quote
    expect(quoteEl.textContent).toBe(testQuote);
    expect(errorMessage()).toBeNull('should not show error');
    done();
  });
});