检查嵌套*ngIf元素是否存在时，Angular测试失败

import { async, ComponentFixture, fakeAsync, TestBed, tick } from '@angular/core/testing';

it('should display nested element when condition is true', fakeAsync(() => {
  // 创建组件和测试环境
  TestBed.configureTestingModule({
    declarations: [YourComponent],
  }).compileComponents();

  // 创建组件实例
  const fixture: ComponentFixture<YourComponent> = TestBed.createComponent(YourComponent);
  const component: YourComponent = fixture.componentInstance;

  // 设置条件为true
  component.condition = true;

  // 执行变更检测
  fixture.detectChanges();

  // 模拟时间的流逝
  tick();

  // 断言嵌套元素存在
  const nestedElement = fixture.nativeElement.querySelector('.nested-element');
  expect(nestedElement).toBeTruthy();
}));