将新创建的angular cli项目转换为使用mocha框架而不是jasmine

npm install -g @angular/cli

ng new my-app

cd my-app

npm install --save-dev mocha chai @types/mocha @types/chai

ng generate component app

import { TestBed } from '@angular/core/testing';
import { AppComponent } from './app.component';
import { expect } from 'chai';

describe('AppComponent', () => {
  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [
        AppComponent
      ],
    }).compileComponents();
  });

  it('should create the app', () => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.componentInstance;
    expect(app).to.be.ok;
  });

  it(`should have as title 'my-app'`, () => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.componentInstance;
    expect(app.title).to.equal('my-app');
  });

  it('should render title', () => {
    const fixture = TestBed.createComponent(AppComponent);
    fixture.detectChanges();
    const compiled = fixture.nativeElement;
    expect(compiled.querySelector('.content span').textContent).to.contain('my-app app is running!');
  });
});

ng test