问题描述
当我运行测试代码时,actual$ 返回一个空数组,expected 返回模拟数据。 原因是 api.ugc.wishlist.getAllFolders() 是异步的。 我应该如何编写测试?
//testing code:
describe('wishlist select',() => {
describe('dispatch a correct action of load',() => {
it('select getAllFolders successfully',() => {
getTestScheduler().run(({ cold,expectObservable }) => {
const action$ = ActionsObservable.from(
cold('(a|)',{
a: actions.load.start(),})
);
const state$ = new StateObservable<IState>(new Subject(),initialState);
const expected$ = {
a: actions.load.done(toFolders(select.items)),};
const actual$ = load(action$,state$,dependencies);
// the actual$ return an empty array.
expectObservable(actual$).toBe('(a|)',expected$);
});
});
});
});
// load epic code:
export const load: IEpic = (action$,{ api }) =>
action$.pipe(
ofType(actions.load.start.getType()),mergeMap(() => {
return from(api.ugc.wishlist.getAllFolders()).pipe( // get mock dara from axios-mock-adapter
mergeMap(response => {
const { items } = response.data;
return of(actions.load.done(toFolders(items)));
})
);
})
);
解决方法
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