模拟API调用和检查错误的Jest问题

我正在使用jest并尝试测试异步登录请求。我可以检查呼叫是否已解决并成功。我还想测试一下呼叫失败的情况。

我一直在跟踪 docs from here .

我明白我不是在做 reject 正确,但如果我移动 jest.mock('.utils/api', () => {... 进入测试块,它不工作,它需要在外面。有人能建议正确的方法吗?

请参阅下面的代码:

import React from 'react';
import { render, fireEvent } from 'react-testing-library';
import Login from './index';
import { login as mockLogin } from './api';

let mockData = {
    token: '12345'
};

let errorData = {
   message: 'Your username/password is incorrect'
};

jest.mock('.utils/api', () => {
    return {
        jsonRequest: jest.fn(() => new Promise((resolve, reject) => {
            resolve(mockData,);
            // I am not doing this correctly.
            reject(errorData);
        })),
    };
});


describe('<Login />', () => {   

    it('returns a sessionId if successful and error if not', () => {

        const { getByLabelText, getByText } = render(<Login />);
        const loginButton = getByText(/login/i);
        fireEvent.click(loginButton);
        expect(mockLogin).toBeCalledTimes(1);
        expect(mockLogin).toHaveBeenCalledWith('/login', {
            data: {
                password: 'test',
                username: 'test',
            },
            method: 'POST',
        });

        expect(mockLogin()).resolves.toBe(mockData);
        expect(mockLogin()).rejects(mockData);
    });
});