NgRX provideMockStore createSelector 状态未定义

Question

当使用提供的 mockStore 时，我的功能/选择器函数只会将状态视为未定义。

因此，我只能模拟选择器，因此无法执行更完全集成的测试。

当模拟商店提供状态时，选择器不应该看到状态还是应该这样做？

创建模拟商店

     TestBed.configureTestingModule({
        providers: [
            AuthGuardGuard,
            provideMockStore({
                initialState: { ...initialState },
            }),
        ],
    });

然后记录选择器应该看到的状态，这是未定义的。

export const currentUser = createSelector(
    authRootFeature,
    (state: fromAuthRoot.State) => {
        console.log(state); // Undefined
        return state.auth.currentUser;
    }
);

Answer 1

MockStore 应该设置状态，我将与您分享两个可行的实现，您可以选择您喜欢的实现，您的问题中缺少信息，因此很难指出为什么这对您不起作用。

这是一个：

我的选择器：

export const selectFeature = createFeatureSelector<State, FeatureState>('feature');

export const getFeatureProperty = createSelector(
  selectFeature,
  (state) => state.featureProperty
);

我的测试文件：

describe('MyComponent', () => {
  let component: MyComponent;
  let fixture: ComponentFixture<MyComponent>;
  let mockStore: MockStore<State>;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [LogsMenuViewComponent, LogsMenuViewDropdownComponent],
      providers: [provideMockStore({ initialState: { feature: { featureProperty: 123 } } as State })],
    }).compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(MyComponent);
    mockStore = TestBed.inject(Store) as MockStore<State>;
    component = fixture.componentInstance;
    fixture.detectChanges();
  });
});

之所以可行，是因为我的选择器使用了一个特性，选择器，所以它能够正确获取状态。

另一个可能对您有用的实现是覆盖选择器，如下所示：

  describe('selectors', () => {
    let mockShowsSelector;
    beforeEach(() => {
      mockShowsSelector = store.overrideSelector(selectFavoriteShows, [{
        id: 3,
        name: 'C',
        description: 'Show C',
        imgUrl: '',
        isFavorite: true
      }]);
      fixture.detectChanges();
    });

    it('should render all favorite shows', () => {
      expect(fixture.debugElement.queryAll(By.css('.mat-card')).length).toBe(1);
    });

    it('should update the UI when the selector changes', () => {
      mockShowsSelector.setResult([ // overide selector
        {
          id: 1,
          name: 'A',
          description: 'Show A',
          imgUrl: '',
          isFavorite: true
        },
        {
          id: 2,
          name: 'B',
          description: 'Show B',
          imgUrl: '',
          isFavorite: true
        }
      ]);
      store.refreshState();
      fixture.detectChanges();
      expect(fixture.debugElement.queryAll(By.css('.mat-card')).length).toBe(2);
    });
  })