如何用Jest模拟uuid [英] How to mock uuid with Jest

问题描述

所以在我找到问题的答案时，我发现了这个帖子： Jest：如何全局模拟node-uuid（或任何其他导入的模块）

so on my search for an answer to my problem I found this post: Jest: How to globally mock node-uuid (or any other imported module)

我已经尝试了答案，但我似乎无法正确使用它，因为它给了我一个未定义的错误。我是测试场景的新手，所以请原谅任何重大错误：

I already tried the answer but I can't seem to use it properly, as it´s giving me an undefined error. I'm new to the testing scene so please excuse any major errors:

这是我的第一个方法

const mockF = jest.mock('uuid'); 

mockF.mockReturnValue('12345789'); 

但它无法识别这些功能。

But it wouldn't recognize the functions.

mockF.mockReturnValue不是我试过的其他函数。

"mockF.mockReturnValue is not a function" among others I tried.

然后我尝试过按照建议的帖子手动模拟，但似乎可以使它工作，你能帮帮我吗？谢谢

Then I tried to manually mock as the post suggested but can' seem to make it work, can you help me? Thanks

如果有帮助，这是整个测试：

Here's the entire test if it helps:

    const faker = require('faker');
    const storageUtils = require('../../storage/utils');
    const utils = require('../utils/generateFile');
    const { generateFileName } = storageUtils;
    const { file } = utils;

    test('should return a valid file name when provided the correct information', () => {
        // ARRANGE
        // create a scope
        const scope = {
            type: 'RECRUITER',
            _id: '987654321',
        };
        // establish what the expected name to be returned is
        const expectedName = 'r_987654321_123456789.png';

        jest.mock('uuid/v4', () => () => '123456789');

        // ACTION
        const received = generateFileName(file, scope);

        // ASSERT
        // expect the returned value to equal our expected one
        expect(received).toBe(expectedName);
    });

推荐答案

对于我的情况我使用了这个 Github问题

for my case I used the answer of this Github issue

jest.mock('uuid/v4', (): () => number => {
 let value = 0;
 return () => value++;
});

这篇关于如何用Jest模拟uuid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！