在 Angular 中对服务进行单元测试时，规范没有期望

Question

所以我的测试通过了，但是这是一个名为 should get the notes 的单元测试，用于 NoteService，当 ng test 是运行时，它在 Karma 中的名称是喜欢

SPEC HAS NO EXPECTATIONS should get the notes

我尝试测试的方法如下：

@Injectable()
export class NoteService {

  readonly baseUrl = "https://localhost:4200";
  readonly httpOptions = {
    headers: new HttpHeaders({
      'Content-Type': 'application/json',
    })
  };

  constructor(private httpClient: HttpClient) { }
 
  getNotes(): Observable<Note[]> {
    return this.httpClient.get<Note[]>(this.baseUrl + `/notes`, this.httpOptions);
  }

单元测试是这样的：

describe('NoteService', () => {
  let service: NoteService;
  
  const mockList = [
    {
      "id": "id1",
      "title": "First note",
      "description": "This is the description for the first note",
      "categoryId": "1"
    },
    {
      "id": "id2",
      "title": "Second note",
      "description": "This is the description for the first note",
      "categoryId": "2"
    }]

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

  it('should be created', () => {
    expect(service).toBeTruthy();
  });

  it('should get the notes', fakeAsync(() => {
    service.getNotes().subscribe((val) => {
      expect(val).toBe(mockList);
    });
  }));
});

所以，为什么说“SPEC HAS NO EXPECTATIONS”呢？我的单元测试有问题吗？我应该如何调整它才能使其正常工作？

Answer 1

这里不需要fakeAsync。您应该使用 done() 来告诉测试它已经完成：

it('should get the notes',((done: DoneFN) => {
    service.getNotes().subscribe((val) => {
        expect(val).toBe(mockList);
        done();
    });
}));

在 Angular 中对服务进行单元测试时，规范没有期望

Spec has no expectations when unit testing a Service in Angular

service

unit-testing

karma-jasmine

angular