如何在构造函数中使用Jasmine私有ActivatedRoute进行测试？

import { ActivatedRoute } from '@angular/router';
import { BehaviorSubject } from 'rxjs';

import { MyClass } from './my-class'; // 要测试的类

class MockActivatedRoute {
  private subject = new BehaviorSubject(this.testParams);
  params = this.subject.asObservable();

  // 设置测试参数
  set testParams(params: any) {
    this.subject.next(params);
  }
}

function createMyClass(routeParams: any) {
  const activatedRoute = new MockActivatedRoute();
  activatedRoute.testParams = routeParams;

  return new MyClass(activatedRoute);
}

describe('MyClass', () => {
  it('should create', () => {
    const myClass = createMyClass({ id: 1 });
    expect(myClass).toBeTruthy();
  });

  it('should get route params', () => {
    const myClass = createMyClass({ id: 1 });
    myClass.getRouteParams().subscribe(params => {
      expect(params.id).toBe(1);
    });
  });
});