如何测试ngrx路由器存储选择器

问题描述 投票：2回答：2

在我们的应用程序中，我们有一个简单的商店，在根级别包含AuthState和RouterState。 RouterState是通过@ngrx/router-store方法创建的。

我们有一些选择器必须使用RouterState来检索例如一个参数，然后将它与例如其他选择器结果组合。

我们的问题是我们无法设法找到正确设置测试套件的方法，以便能够测试这样的组合选择器。

Reducer setup

App模块导入

StoreModule.forRoot(reducers, { metaReducers }),
StoreRouterConnectingModule.forRoot({
  stateKey: 'router',
}),
StoreDevtoolsModule.instrument(),

reducers有以下几点：

减速

export interface RouterStateUrl {
  url: string;
  queryParams: Params;
  params: Params;
}

export interface State {
  router: fromNgrxRouter.RouterReducerState<RouterStateUrl>;
  auth: fromAuth.AuthState;
}

export const reducers: ActionReducerMap<State> = {
  router: fromNgrxRouter.routerReducer,
  auth: fromAuth.reducer,
};

export const getRouterState = createFeatureSelector<fromNgrxRouter.RouterReducerState<RouterStateUrl>>('router');

export const getRouterStateUrl = createSelector(
  getRouterState,
  (routerState: fromNgrxRouter.RouterReducerState<RouterStateUrl>) => routerState.state
);

export const isSomeIdParamValid = createSelector(
  getRouterState,
  (routerS) => {
    return routerS.state.params && routerS.state.params.someId;
  }
);

这是AuthState reducer：

export interface AuthState {
  loggedIn: boolean;
}

export const initialState: AuthState = {
  loggedIn: false,
};

export function reducer(
  state = initialState,
  action: Action
): AuthState {
  switch (action.type) {
    default: {
      return state;
    }
  }
}

export const getAuthState = createFeatureSelector<AuthState>('auth');
export const getIsLoggedIn = createSelector(
  getAuthState,
  (authState: AuthState) => {
    return authState.loggedIn;
  }
);

export const getMixedSelection = createSelector(
  isSomeIdParamValid,
  getIsLoggedIn,
  (paramValid, isLoggedIn) => paramValid && isLoggedIn
)

Test setup

@Component({
  template: ``
})
class ListMockComponent {}

describe('Router Selectors', () => {
  let store: Store<State>;
  let router: Router;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [
        RouterTestingModule.withRoutes([{
          path: 'list/:someId',
          component: ListMockComponent
        }]),
        StoreModule.forRoot({
          // How to add auth at that level
          router: combineReducers(reducers)
        }),
        StoreRouterConnectingModule.forRoot({
          stateKey: 'router',
        }),
      ],
      declarations: [ListMockComponent],
    });

    store = TestBed.get(Store);
    router = TestBed.get(Router);
  });

测试及其结果

Test 1

it('should retrieve routerState', () => {
  router.navigateByUrl('/list/123');
  store.select(getRouterState).subscribe(routerState => console.log(routerState));
});

{router：{state：{url：'/ list / 123'，params：{someId：123}，queryParams：{}}，navigationId：1}，auth：{loggedIn：false}}

你可以看到getRouterState选择器不只检索状态的router切片，而是一个包含整个routerState + authState State的对象。 router和auth是此对象的子级。因此选择器无法检索正确的切片。

Test 2

it('should retrieve routerStateUrl', () => {
  router.navigateByUrl('/list/123');
  store.select(getRouterStateUrl).subscribe(value => console.log(value));
});

undefined - TypeError：无法读取未定义的属性“state”

Test 3

it('should retrieve mixed selector results', () => {
  router.navigateByUrl('/list/123');
  store.select(getMixedSelection).subscribe(value => console.log(value));
});

未定义

TypeError：无法读取未定义的属性“state”

TypeError：无法读取{auth：{}的属性'loggedIn'，路由器：{}}

注意

请注意语法

StoreModule.forRoot({
  // How to add auth at that level
  router: combineReducers(reducers)
}),

如果我们想要使用多个reducer组合选择器，似乎是强制性的。我们可以使用forRoot(reducers)然后我们不能只测试路由器选择器。国家的其他部分将不存在。

例如，如果我们需要测试：

export const getMixedSelection = createSelector(
  isSomeIdParamValid,
  getIsLoggedIn,
  (paramValid, isLoggedIn) => paramValid && isLoggedIn
)

我们需要路由器和auth。而且我们找不到合适的测试设置，它允许我们使用AuthState和RouterState测试这样的组合选择器。

The problem

如何设置此测试以便我们基本上可以测试我们的选择器？

当我们运行应用程序时，它完美运行。所以问题只在于测试设置。

我们认为使用真实路由器设置testBed可能是错误的想法。但我们很难模拟routerSelector（仅）并给它一个模拟的路由器状态片仅用于测试目的。

仅模拟这些路由器选择器真的很难。对store.select进行间谍活动很容易，但在store.select(routerSelectorMethod)上进行间谍活动，方法作为争论变得一团糟。

angular ngrx ngrx-router-store
2个回答
1
投票

现在，您可以使用projector属性模拟选择器依赖项：

我-reducer.ts

export interface State {
  evenNums: number[];
  oddNums: number[];
}

export const selectSumEvenNums = createSelector(
  (state: State) => state.evenNums,
  (evenNums) => evenNums.reduce((prev, curr) => prev + curr)
);
export const selectSumOddNums = createSelector(
  (state: State) => state.oddNums,
  (oddNums) => oddNums.reduce((prev, curr) => prev + curr)
);
export const selectTotal = createSelector(
  selectSumEvenNums,
  selectSumOddNums,
  (evenSum, oddSum) => evenSum + oddSum
);

我-reducer.spec.ts

import * as fromMyReducers from './my-reducers';

describe('My Selectors', () => {

  it('should calc selectTotal', () => {
    expect(fromMyReducers.selectTotal.projector(2, 3)).toBe(5);
  });

});

取自official docs

2
投票

我自己也在努力解决这个问题，路由器状态的'state'属性是未定义的。我找到了适合我的解决方案是调用router.initialNavigation（）来启动RouterTestingModule，后者又设置了路由器存储。

在我的情况下，我需要测试一个使用根存储选择器和功能存储选择器的CanActivate防护。下面的测试模块设置适用于我：

describe('My guard', () => {

   let myGuard: MyGuard;
   let router: Router;
   let store: Store<State>;

   beforeEach(async(() => {
       TestBed.configureTestingModule({
           imports: [
               RouterTestingModule.withRoutes([
                   {
                       path: '',
                       redirectTo: 'one',
                       pathMatch: 'full'
                   },
                   {
                       path: 'one',
                       component: MockTestComponent
                   },
                   {
                       path: 'two',
                       component: MockTestComponent
                   }
               ]),
               StoreModule.forRoot({
                   ...fromRoot.reducers,
                   'myFeature': combineReducers(fromFeature.reducers)
               }),
               StoreRouterConnectingModule.forRoot({
                   stateKey: 'router', // name of reducer key
               }),
           ],
           declarations: [MockTestComponent],
           providers: [MyGuard, {provide: RouterStateSerializer, useClass: CustomSerializer}]
       }).compileComponents();

       myGuard = TestBed.get(MyGuard);
       router = TestBed.get(Router);
       store = TestBed.get(Store);
       spyOn(store, 'dispatch').and.callThrough();
       router.initialNavigation();
   }));
});
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