describe('TimeSlotService', () => {
  beforeEach(() => TestBed.configureTestingModule({
    providers: [
      { provide: ApiService, useValue: MockApiService }
    ],
    imports: [ HttpClientTestingModule ]
  }));

  it('should be created', () => {
    const service: TimeSlotService = TestBed.get(TimeSlotService);
    expect(service).toBeTruthy();
  });
});