如何在angular5+中对组件进行单元测试时提供注入值

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

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

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [ MyComponent ],
      providers: [
        { provide: SomeService, useValue: mockSomeService }
      ]
    })
    .compileComponents();
  });
});

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

it('should display the correct title', () => {
  expect(component.title).toBe('My Component');
});

it('should call a method on button click', () => {
  spyOn(component, 'onClick');
  const button = fixture.nativeElement.querySelector('button');
  button.click();
  expect(component.onClick).toHaveBeenCalled();
});