为什么在Angular typescript应用程序的Jasmine测试中primeng对话框为空

import { DialogModule } from 'primeng/dialog';

beforeEach(async(() => {
  TestBed.configureTestingModule({
    imports: [
      DialogModule,
      // 其他需要的模块
    ],
    declarations: [ YourComponent ],
    // 其他配置
  })
  .compileComponents();
}));

it('should display dialog content', fakeAsync(() => {
  component.openDialog(); // 假设这是触发对话框显示的方法
  tick(); // 模拟时间的流逝，等待异步任务完成
  fixture.detectChanges(); // 触发数据绑定和视图更新
  expect(...).toBeTruthy();
}));

it('should show dialog when condition is true', () => {
  component.showDialog = true; // 确保对话框应该显示
  fixture.detectChanges(); // 更新视图
  const dialogElement = fixture.debugElement.query(By.css('p-dialog'));
  expect(dialogElement).not.toBeNull();
});

it('should display dialog in the document body', () => {
  component.openDialog();
  fixture.detectChanges();
  const dialogElement = document.querySelector('p-dialog');
  expect(dialogElement).toBeTruthy();
});

afterEach(() => {
  // 清理代码，如关闭对话框
  component.closeDialog();
  fixture.detectChanges();
});