it('should display original title', () => {
  // Hooray! No `fixture.detectChanges()` needed
  expect(h1.textContent).toContain(comp.title);
});

it('should still see original title after comp.title change', () => {
  const oldTitle = comp.title;
  comp.title = 'Test Title';
  // Displayed title is old because Angular didn't hear the change :(
  expect(h1.textContent).toContain(oldTitle);
});

it('should display updated title after detectChanges', () => {
  comp.title = 'Test Title';
  fixture.detectChanges(); // detect changes explicitly
  expect(h1.textContent).toContain(comp.title);
});