如何在Angular中测试cdkConnectedOverlay

import { ComponentFixture, TestBed } from '@angular/core/testing';
import { OverlayModule } from '@angular/cdk/overlay';
import { TestComponent } from './test.component';

describe('TestComponent', () => {
  let component: TestComponent;
  let fixture: ComponentFixture<TestComponent>;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [TestComponent],
      imports: [OverlayModule],
    }).compileComponents();
  });

  beforeEach(() => {
    fixture = TestBed.createComponent(TestComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });

  // Add more test cases as needed
});

import { ComponentFixture, TestBed } from '@angular/core/testing';
import { OverlayModule } from '@angular/cdk/overlay';
import { TestComponent } from './test.component';

describe('TestComponent', () => {
  let component: TestComponent;
  let fixture: ComponentFixture<TestComponent>;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [TestComponent],
      imports: [OverlayModule],
    }).compileComponents();
  });

  beforeEach(() => {
    fixture = TestBed.createComponent(TestComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });

  it('should open overlay when button is clicked', () => {
    const button = fixture.nativeElement.querySelector('button');
    button.click();
    fixture.detectChanges();
    const overlay = document.querySelector('.cdk-overlay-pane');
    expect(overlay).toBeTruthy();
  });

  // Add more test cases as needed
});