使用Jest进行Angular click事件Dom单元测试

npm install --save-dev jest @types/jest jest-preset-angular

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

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

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

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

  it('should trigger click event', () => {
    const button = fixture.nativeElement.querySelector('button');
    spyOn(component, 'onClick');
    button.click();
    expect(component.onClick).toHaveBeenCalled();
  });
});