Javascript 为什么getting无法读取属性'；然后'；post调用的未定义in jest测试的定义？

我需要一些开玩笑测试的帮助。我收到错误

TypeError:无法读取测试中未定义的属性“then”

行动中的签名功能创建者进行后期调用

import {SIGNING_IN, SIGNED_IN, SIGNING_FAILED, SIGNED_OUT} from "../actionTypes";
import {makePostCall} from "../../api/apiCalls";

export function signIn(data){
    return dispatch => {
        dispatch({type: SIGNING_IN});
        makePostCall('http://localhost:8000/api/v1/signin', data)
            .then(response => {
                const auth = {token: response.token, userId: response.id};
                localStorage.setItem('auth', JSON.stringify(auth));
                dispatch({type: SIGNED_IN, message: 'You signed in successfully.'});
            })
            .catch(error => {
                console.log('error: ', error);
                dispatch({type: SIGNING_FAILED, message: 'Email or Password incorrect. Please try again!'});
            });

    }
}

export function makePostCall(url, data){
    return axios({method: 'post', url, data})
        .then(response => response.data)
}

这是在上述调用中调用的调用后函数

import {SIGNING_IN, SIGNED_IN, SIGNING_FAILED, SIGNED_OUT} from "../actionTypes";
import {makePostCall} from "../../api/apiCalls";

export function signIn(data){
    return dispatch => {
        dispatch({type: SIGNING_IN});
        makePostCall('http://localhost:8000/api/v1/signin', data)
            .then(response => {
                const auth = {token: response.token, userId: response.id};
                localStorage.setItem('auth', JSON.stringify(auth));
                dispatch({type: SIGNED_IN, message: 'You signed in successfully.'});
            })
            .catch(error => {
                console.log('error: ', error);
                dispatch({type: SIGNING_FAILED, message: 'Email or Password incorrect. Please try again!'});
            });

    }
}

export function makePostCall(url, data){
    return axios({method: 'post', url, data})
        .then(response => response.data)
}

签名方法测试

jest.mock('../../../src/api/apiCalls');

describe('authenticationActionCreators', () => {
    describe('signIn', () => {

        let dispatch;
        beforeEach(() => {
            jest.clearAllMocks();
            const authResponse = getAuthResponse();
            makePostCall.mockReturnValue(Promise.resolve(authResponse));
            dispatch = jest.fn();
        });

        test('should make post call with correct URL and data', () => {
            const data = {email: 'user@user.com', password: 'password'};
            return signIn(data)(dispatch).then(() => {
                expect(makePostCall).toHaveBeenCalledWith('http://localhost:8000/api/v1/signin', {
                    email: 'user@user.com',
                    password: 'password'
                })
            })
        });

    });

---

每当我运行测试时，我在返回签名（数据）（调度）行上得到错误。然后（（）=>{

我做错了。我更改了它，它工作了

test('should make post call with correct URL and data', () => {
            const data = {email: 'user@user.com', password: 'password'};
            signIn(data)(dispatch);
            expect(makePostCall).toHaveBeenCalledWith('http://localhost:8000/api/v1/signin', {
                email: 'user@user.com',
                password: 'password'
            })
        });

---

sign（…）（…）

不返回任何内容。您忘记了

return

在

makePostCall（…）之前http://...“，data）

@str你是说？登录（数据）（调度）。然后（（）=>{返回expect（makePostCall）。以（“”，{电子邮件：'user@user.com，password:'password'}）它仍然会给出相同的错误。否。我的意思是你应该直接在

makepostall（'s）前面添加
return
http://...，数据）

（即

返回makePostCall（'http://...，数据）

）。