如何对此canActivate保护进行单元测试

import { TestBed } from '@angular/core/testing';
import { RouterTestingModule } from '@angular/router/testing';
import { ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { MyAuthGuard } from './my-auth.guard';

describe('MyAuthGuard', () => {
  let guard: MyAuthGuard;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [RouterTestingModule],
      providers: [MyAuthGuard]
    });
    guard = TestBed.inject(MyAuthGuard);
  });

  it('should allow access if user is authenticated', () => {
    // Mock authenticated user
    spyOn(guard.authService, 'isAuthenticated').and.returnValue(true);

    const route: ActivatedRouteSnapshot = null;
    const state: RouterStateSnapshot = null;

    expect(guard.canActivate(route, state)).toBe(true);
  });

  it('should deny access if user is not authenticated', () => {
    // Mock unauthenticated user
    spyOn(guard.authService, 'isAuthenticated').and.returnValue(false);

    const route: ActivatedRouteSnapshot = null;
    const state: RouterStateSnapshot = null;

    expect(guard.canActivate(route, state)).toBe(false);
  });
});