use case: use InMemoryDbService as a MockBackend in unit tests

[asnowwolf]

We can use InMemoryDbService as a MockBackend in unit tests. It is very convenient in most simple scenes.

In this scenario we need:

1. Make the resetDb method to public.
2. All the data sources are cloned as working data, so as not to modify the original copy

Workground:

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [
        HttpModule,
        InMemoryWebApiModule.forRoot(MockDbService),
      ],
      providers: [ProgramApi, InMemoryBackendService],
    });
  });

  let api: ProgramApi;
  let backend: InMemoryBackendService;

  beforeEach(inject([ProgramApi, InMemoryBackendService], (_api_: ProgramApi, _backend_: InMemoryBackendService) => {
    api = _api_;
    backend = _backend_;
  }));

  afterEach(() => {
    backend['resetDb']();
  });

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

  ...

[winnemucca]

I like this approach, but where are you getting ProgramApi (I realize this isn't part of angular)?

[asnowwolf]

It's a service of the application.