[英]How to mock @ngrx/store state in Angular 8 unit tests with MockStore and MemoizedSelector
[英]Mock ngrx/store in Angular2 tests
你可以幫我嘲笑商店嗎? 我已經看到了這個和這個問題有一個不同的錯誤。 我在我的一個服務中使用商店,我使用dispatch,select和get store方法。 我在@noelmace建議之后嘲笑了商店,並使用了以下調度程序,reducer和state創建商店:
export class ObservableMock implements Observer<any> {
closed?: boolean = false; // inherited from Observer
nextVal: any = ''; // variable I made up
constructor() {
}
next = (value: any): void => {
this.nextVal = value;
};
error = (err: any): void => {
console.error(err);
};
complete = (): void => {
this.closed = true;
}
}
let _reducer: ObservableMock = new ObservableMock();
let _dispatcher: ObservableMock = new ObservableMock();
let state$: Observable<any> = new Observable<any>();
所以我的Mockstore類看起來如下:
export class MockStore<T> extends Store<T> {
//as given above
constructor() {
super(_dispatcher, _reducer, state$);
}
//as given above
}
但是,當我嘗試按照測試方式定義我的服務時,它說
TypeError:_store.select不是函數
此失敗是由TestedService構造函數中的以下行引起的:
constructor(private _store: Store<TabStore>) {
let tabStore: Observable<TabStore> = _store.select<TabStore>('myReducer');|
}
這是我的測試:
beforeEach(() => {
TestBed.configureTestingModule({
imports: [
// StoreModule.provideStore({myReducer: myReducer}),
],
providers: [
{provide: Store, useClass: MockStore},
{
provide: TestedService,
useFactory: (tabStore: Store<TabStore>): TestedService=> {
return new TestedService(myStore);
},
deps: [Store]
}
]
});
});
評論進口也無濟於事。 有沒有人有想法嘲笑有什么問題?
最后,我找到了一個模擬商店的解決方案。 不確定@maxisam的回答是對還是錯,但這里是我用過的解決方案。
let _reducer: ObservableMock = new ObservableMock();
let _dispatcher: ObservableMock = new ObservableMock();
let state$: Observable<any> = new Observable<any>();
export class MockStore<T> extends Store<T> {
private _fakeData: Object = {};
private fakeDataSubject: BehaviorSubject<Object> = new BehaviorSubject(this._fakeData);
select = <T, R>(mapFn: any, ...paths: string[]): Observable<any> => {
if (typeof mapFn !== 'function') {
mapFn = () => mapFn;
}
return this.fakeDataSubject.map(mapFn);
};
constructor() {
super(_dispatcher, _reducer, state$);
}
nextMock(mock: Object, ...keys: string[]) {
let curMockLevel = this._fakeData = {};
keys.forEach((key, idx) => {
curMockLevel = curMockLevel[key] = idx === keys.length - 1 ? mock : {};
});
this.fakeDataSubject.next(this._fakeData);
}
get fakeData() {
return this._fakeData;
}
}
這可以在以后使用如下:
{provide: Store, useClass: MockStore}
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