修改导航属性的组件方法可以进行单元测试吗？

// navigation.js
class Navigation {
  constructor() {
    this.routes = [];
  }

  addRoute(route) {
    this.routes.push(route);
  }

  removeRoute(route) {
    const index = this.routes.indexOf(route);
    if (index !== -1) {
      this.routes.splice(index, 1);
    }
  }
}

module.exports = Navigation;

// navigation.test.js
const Navigation = require('./navigation');

test('addRoute should add a route to the routes array', () => {
  const nav = new Navigation();
  nav.addRoute('/home');
  expect(nav.routes).toContain('/home');
});

test('removeRoute should remove a route from the routes array', () => {
  const nav = new Navigation();
  nav.addRoute('/home');
  nav.removeRoute('/home');
  expect(nav.routes).not.toContain('/home');
});