如何捕获生命周期方法中抛出的Angular组件错误

我有一个具有所需输入的Angular 组件，如果没有提供，我会抛出错误.

export class FormValidationMessageComponent implements OnInit {
  @Input() form!: NgForm;
  @Input() field!: NgModel;

  ngOnInit(): void {
    if (typeof this.form === 'undefined') throw new Error(`The 'form' property is not set!`);
    if (typeof this.field === 'undefined') throw new Error(`The 'field' property is not set!`);
  }
}

我如何测试此行为？当没有提供任何东西时，它确实会在我的测试中抛出一个错误，但是我如何在我的expect中捕获这个错误呢？

let component: FormValidationMessageComponent;
let fixture: ComponentFixture<FormValidationMessageComponent>;

beforeEach(() => {
  TestBed.configureTestingModule({
    imports: [FormValidationMessageComponent],
  });
  fixture = TestBed.createComponent(FormValidationMessageComponent);
  component = fixture.componentInstance;
});

it('should throw an error when the `form` input is not provided', () => {
  const onInitSpy = spyOn(component, 'ngOnInit');
  component.field = {} as NgModel;

  fixture.detectChanges(); //Triggers ngOnInit()

  expect(onInitSpy).toThrow();
});

上述测试仍会抛出错误，并且测试失败

Error: The 'form' property is not set!

我也试了expect(component).toThrow();次，结果都是一样的