如何为在ngOnInit中调用的函数编写一个jasmine测试用例？

import { ComponentFixture, TestBed } from '@angular/core/testing';
import { MyComponent } from './my-component.component';

describe('MyComponent', () => {
  let component: MyComponent;
  let fixture: ComponentFixture<MyComponent>;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [ MyComponent ]
    })
    .compileComponents();
  });

  beforeEach(() => {
    fixture = TestBed.createComponent(MyComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should call myFunction on ngOnInit', () => {
    spyOn(component, 'myFunction');
    component.ngOnInit();
    expect(component.myFunction).toHaveBeenCalled();
  });
});

ng test