为什么无法在玩笑测试中读取未定义的'then'属性'then'以进行邮寄？

Question

我需要关于笑话测试的帮助。我的测试中出现错误TypeError: Cannot read property 'then' of undefined

Action Creators中的signIn函数进行POST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!'});
            });

    }
}

这是在上述调用中被调用的POST调用函数

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

登录方法测试

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: '[email protected]', password: 'password'};
            return signIn(data)(dispatch).then(() => {
                expect(makePostCall).toHaveBeenCalledWith('http://localhost:8000/api/v1/signin', {
                    email: '[email protected]',
                    password: 'password'
                })
            })
        });

    });

[每当我运行测试时，我在行return signIn(data)(dispatch).then(() => {上都会出现错误

Answer 1

我做错了。我更改了它，它的工作原理

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