如何在使用Jest和redux动作时匹配返回的Promise [英] how to match a returned Promise in using Jest with redux action
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问题描述
我正在将reactjs与redux一起使用，并且操作是使用axios并返回Promise.我的测试与类型不匹配.我尝试了不同的方法，但最终遇到了同样的问题.还尝试了 https://www.leighhalliday.com/mocking- axios在玩笑中测试异步功能
I am using reactjs with redux and the action is using axios and returning a Promise. my test is not matching the type. I have tried different ways of doing it but end up with the same problem. also tried https://www.leighhalliday.com/mocking-axios-in-jest-testing-async-functions
import configureMockStore from 'redux-mock-store'
//import fetchMock from 'fetch-mock'
import expect from 'expect' // You can use any testing library
import axios from 'axios';
import MockAdapter from 'axios-mock-adapter';
import * as actions from '../../../app/actions/admin'
import * as types from '../../../app/reducers/reducer_content'
//const middlewares = [thunk]
const mockStore = configureMockStore()
descri
be('async actions', () => {
it('FETCH_CONTENT_VIDEO_LIST', () => {
let mock = new MockAdapter(axios);
const data = { response: true };
mock.onGet('/contentvideolist').reply(200, data);
console.log(types);
const expectedActions = [{"payload": {}, "type": actions.FETCH_CONTENT_VIDEO_LIST}]
const store = mockStore({ fetch_content_video_list: [] })
console.log(actions);
store.dispatch(actions.fetchContentVideoList());
expect(store.getActions()).toEqual(expectedActions);
});
});
这是结果
expect(received).toEqual(expected)
Expected value to equal:
[{"payload": {}, "type": "fetch_content_video_list"}]
Received:
[{"payload": {}, "type": "fetch_content_video_list"}]
Difference:
- Expected
+ Received
Array [
Object {
-
"payload": Object {},
+ "payload": Promise {},
"type": "fetch_content_video_list",
},
]
actions/admin.js
export const FETCH_CONTENT_VIDEO_LIST = 'fetch_content_video_list';
export function fetchContentVideoList(page, size, where, sort) {
const request = axios.get(`/api/user/get/content/management/method/video/list/format/json?quiet=1&page=` + page + `&size=` + size + `&where=` + JSON.stringify(where) + `&sort=` + sort);
return {
type: FETCH_CONTENT_VIDEO_LIST,
payload: request
};
}
更新后出现新错误
Actions must be plain objects. Use custom middleware for async actions.
23 | const store = mockStore({ fetch_content_video_list: [] })
24 | console.log(actions);
> 25 | store.dispatch(actions.fetchContentVideoList());
26 | expect(store.getActions()).toEqual(expectedActions);
27 | });
28 | });
更新
import configureMockStore from 'redux-mock-store'
import promise from 'redux-promise';
import expect from 'expect' // You can use any testing library
import axios from 'axios';
import MockAdapter from 'axios-mock-adapter';
import * as actions from '../../../app/actions/admin'
import * as types from '../../../app/reducers/reducer_content'
const middlewares = [promise]
const mockStore = configureMockStore(middlewares)
describe('async actions', () => {
it('FETCH_CONTENT_VIDEO_LIST', () => {
let mock = new MockAdapter(axios);
const data = { response: true };
mock.onGet('/contentvideolist').reply(200, data);
console.log(types);
const expectedActions = [{"payload": {}, "type": actions.FETCH_CONTENT_VIDEO_LIST}]
const store = mockStore({ fetch_content_video_list: [] })
console.log(actions);
store.dispatch(actions.fetchContentVideoList());
expect(store.getActions()).toEqual(expectedActions);
});
});
我添加了诺言作为中间件
i added promise as middleware
结果
(node:19685) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 3): Error: Request failed with status code 404
(node:19685) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
FAIL tests/jest/actions/admin.test.js
async actions
✕ FETCH_CONTENT_VIDEO_LIST (43ms)
● async actions › FETCH_CONTENT_VIDEO_LIST
expect(received).toEqual(expected)
Expected value to equal:
[{"payload": {}, "type": "fetch_content_video_list"}]
Received:
[]
Difference:
- Expected
+ Received
- Array [
- Object {
- "payload": Object {},
- "type": "fetch_content_video_list",
- },
- ]
+ Array []
24 | console.log(actions);
25 | store.dispatch(actions.fetchContentVideoList());
> 26 | expect(store.getActions()).toEqual(expectedActions);
27 | });
28 | });
29 |
at Object.<anonymous> (tests/jest/actions/admin.test.js:26:32)
console.log tests/jest/actions/admin.test.js:21
{ default: [Function] }
console.log tests/jest/actions/admin.test.js:24
{ FETCH_CONTENT_VIDEO_LIST: 'fetch_content_video_list',
fetchContentVideoList: [Function: fetchContentVideoList],
FETCH_CONTENT_VIDEO_LIST_COUNT: 'fetch_content_video_list_count',
UPDATE_CONTENT_VIDEO_LIST: 'update_content_video_list',
fetchContentVideoListCount: [Function: fetchContentVideoListCount],
updateContentVideoList: [Function: updateContentVideoList] }
已修复
添加了then子句.这是正确的方法吗?
added a then clause. is this correct way to do this?
import configureMockStore from 'redux-mock-store'
import promise from 'redux-promise';
import expect from 'expect' // You can use any testing library
import axios from 'axios';
import * as actions from '../../../app/actions/admin'
const middlewares = [promise]
const mockStore = configureMockStore(middlewares)
const store = mockStore({ })
beforeEach(() => { // Runs before each test in the suite
store.clearActions();
});
describe('async actions', () => {
it('FETCH_CONTENT_VIDEO_LIST', () => {
const expectedActions = [{"payload": {}, "type": actions.FETCH_CONTENT_VIDEO_LIST}]
store.dispatch(actions.fetchContentVideoList()).then(() => {
expect(store.getActions()).toEqual(expectedActions);
});
});
it('FETCH_CONTENT_VIDEO_LIST_COUNT', () => {
const expectedActions = [{"payload": {}, "type": actions.FETCH_CONTENT_VIDEO_LIST_COUNT}]
store.dispatch(actions.fetchContentVideoListCount()).then(() => {
expect(store.getActions()).toEqual(expectedActions);
});
});
it('UPDATE_CONTENT_VIDEO_LIST', () => {
const expectedActions = [{"payload": {}, "type": actions.UPDATE_CONTENT_VIDEO_LIST}]
store.dispatch(actions.updateContentVideoList()).then(() => {
expect(store.getActions()).toEqual(expectedActions);
});
});
});
推荐答案
fetchContentVideoList不等待承诺被解决或拒绝，因此payload成为未解决的承诺.
fetchContentVideoList doesn't wait for the promise to be resolved or rejected, so the payload becomes the unresolved promise.
解决此问题的一种方法是使用async/await方法:
One way to fix this would be to use the async/await method:
export async function fetchContentVideoList(page, size, where, sort) {
const request = await axios.get('url');
return {
type: FETCH_CONTENT_VIDEO_LIST,
payload: request
};
}
请参见关于MDN的异步文档有关更多信息.
编辑问题更新
此更改将操作转变为异步操作，这意味着需要以略有不同的方式来处理它.在兑现诺言之后(如您所做的那样)做出期望是测试行动的一种好方法.
This change turns the action into an asynchronous action, which means that it needs to be handled in a slightly different way. Making the expections after the promise has resolved (as you are doing) is one good way to test the action.
这篇关于如何在使用Jest和redux动作时匹配返回的Promise的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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