beforeEach(() => {
  fixture = TestBed.configureTestingModule({
    declarations: [ AboutComponent, HighlightDirective],
    schemas:      [ NO_ERRORS_SCHEMA ]
  })
  .createComponent(AboutComponent);
  fixture.detectChanges(); // initial binding
});

it('should have skyblue ‹h2›', () => {
  const h2: HTMLElement = fixture.nativeElement.querySelector('h2');
  const bgColor = h2.style.backgroundColor;
  expect(bgColor).toBe('skyblue');
});