如何在@ngrx/ EntityCollectionServiceBase中对数据进行单元测试？

import { TestBed } from '@angular/core/testing';
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
import { EntityCollectionServiceBase } from '@ngrx/data';
import { MyEntity } from './my-entity.model';
import { MyEntityService } from './my-entity.service';

describe('MyEntityService', () => {
  let service: MyEntityService;
  let httpMock: HttpTestingController;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      providers: [MyEntityService]
    });
    service = TestBed.inject(MyEntityService);
    httpMock = TestBed.inject(HttpTestingController);
  });

  afterEach(() => {
    httpMock.verify();
  });

  it('should retrieve entities from the server', () => {
    const mockEntities: MyEntity[] = [
      { id: 1, name: 'Entity 1' },
      { id: 2, name: 'Entity 2' }
    ];

    service.getAll().subscribe(entities => {
      expect(entities).toEqual(mockEntities);
    });

    const req = httpMock.expectOne('api/my-entities');
    expect(req.request.method).toBe('GET');
    req.flush(mockEntities);
  });

  it('should add an entity to the server', () => {
    const newEntity: MyEntity = { id: 3, name: 'New Entity' };

    service.add(newEntity).subscribe(entity => {
      expect(entity).toEqual(newEntity);
    });

    const req = httpMock.expectOne('api/my-entities');
    expect(req.request.method).toBe('POST');
    expect(req.request.body).toEqual(newEntity);
    req.flush(newEntity);
  });

  // More test cases...
});