如何使用jest在Angular中测试ngAfterViewInit

npm install --save-dev jest @angular-builders/jest

module.exports = {
  preset: 'jest-preset-angular',
  setupFilesAfterEnv: ['<rootDir>/setup-jest.ts'],
  testPathIgnorePatterns: ['<rootDir>/node_modules/'],
};

import 'jest-preset-angular';

import { Component, AfterViewInit } from '@angular/core';

@Component({
  selector: 'app-my-component',
  template: '<div></div>'
})
export class MyComponent implements AfterViewInit {
  ngAfterViewInit() {
    // 在这里编写你的逻辑
  }
}

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]
    }).compileComponents();
  });

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

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

npx jest