[Angular 11-12][Jasmine]测试来自MatDialog的afterClosed()暂停的问题

import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
import { MatDialog } from '@angular/material/dialog';

describe('YourComponent', () => {
  let component: YourComponent;
  let fixture: ComponentFixture<YourComponent>;
  let matDialog: MatDialog;

  beforeEach(waitForAsync(() => {
    TestBed.configureTestingModule({
      declarations: [YourComponent],
      providers: [MatDialog]
    }).compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(YourComponent);
    component = fixture.componentInstance;
    matDialog = TestBed.inject(MatDialog);
    fixture.detectChanges();
  });

  it('should test afterClosed()', (done) => {
    spyOn(matDialog, 'open').and.returnValue({
      afterClosed: () => {
        return {
          toPromise: () => Promise.resolve() // 模拟异步操作完成
        };
      }
    });

    // 调用包含afterClosed()的方法
    component.openDialog();

    // 使用async和await等待异步操作完成
    fixture.whenStable().then(() => {
      // 在这里进行断言和期望结果的验证

      // 调用done函数，通知Jasmine测试已经完成
      done();
    });
  });
});