javascript-如何用Jest模拟uuid

因此,在寻找问题的答案时,我发现了该帖子：Jest: How to globally mock node-uuid (or any other imported module)

我已经尝试了答案,但似乎无法正确使用它,因为它给了我未定义的错误.我是测试领域的新手,所以请原谅任何重大错误：

这是我的第一个方法

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

mockF.mockReturnValue('12345789'); 

但是它无法识别功能.

“mockF.mockReturnValue is not a function” among others I tried.

然后我尝试按照帖子的建议进行手动模拟,但似乎无法使其正常工作,您能帮我吗？谢谢

这是整个测试是否有帮助：

    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);
    });

解决方法:

通过使用嘲笑模仿它.

import uuid from 'uuid/v4';
jest.mock('uuid/v4');

describe('mock uuid', () => {
  it('should return testid }', () => {
    uuid.mockImplementation(() => 'testid');
    ...
  });  
});

确保正确导入uuid(使用正确的版本参考,例如v4,v3 …)

标签：javascript,jestjs,uuid
来源： https://codeday.me/bug/20191011/1889171.html