之前我研究了一下使用SpyObject来测试NGRX，但这种方法有一个缺点：
You need to mock everything of the spyObject like pipe(), select(), etc. But actually, we may want to test with the real implementation of store, appState, action and selector.
Assuming we have
export const appReducers: ActionReducerMap<AppState, any> = {
feature1: feature1Reducer,
feature2: feature2Reducer
};
export class ChangeExpandedState implements Action {
readonly type = Feature1ActionTypes.CHANGE_EXPANDED_STATE; // action enum used in reducer，this is old, use https://ngrx.io/api/store/createReducer instead
constructor(
public payload: { section: string; subSection?: string; id?: string | null }
) {}
}
export function feature1Reducer (state = initialFeature1State, action: Feature1Actions): feature1State {
switch (action.type) {
case Feature1ActionTypes. Feature1_LIST_CHANGE:
return {
...state,
feature1List: action.payload.updatedFeature1List
};
……
case Feature1ActionTypes. CHANGE_EXPANDED_STATE:
const expandBuilder = state.expandState;
// do something to flipflop based on action.payload.section
return {
...state,
expandState: expandBuilder
};
}
}
In test spec file’s async beforeEach:
TestBed.configureTestingModule({
imports: [
StoreModule.forRoot(appReducers),
…]
…..
}).compileComponents();
testStore = TestBed.get(Store);
测试用例：
it('should subscribe to someActionState change, () => {
expect(component.isSomeActionEnabled).toBeFalsy();
component.isActionSuccess = true; // showing the action response
testStore.dispatch(new ChangeExpandedState({ section: "someAction" }));
expect(component.someFeatureEnabled).toBeTruthy();
expect(component.isActionSuccess).toBeFalsy(); // clear last time response
testStore.dispatch(new ChangeExpandedState({ section: "someAction" }));
expect(component.isSomeActionEnabled).toBeFalsy();
});