In that case, you can try one of the other approaches in this article. Spying on the function using jest.spyOn Another approach to mock a particular function from an imported module is to use the jest.spyOn function. The API for this function seems to be exactly what we need for our ...
//test.jsimport defaultExport, {bar, foo} from '../foo-bar-baz';jest.mock('../foo-bar-baz', () => {// 真实的 foo-bar-baz 模块内容const originalModule = jest.requireActual('../foo-bar-baz');// Mock 默认导出和 foo 的内容return {__esModule: true,...originalModule,default: ...
这个答案的亮点是jest.requireActual（），这是一个非常有用的实用程序，它说：“嘿，保持每个原始功能...
import nodeModulePackage from 'nodeModulePackage'; 所以我需要将其模拟为默认值,因为我不断收到错误 (0, _blah.default) is not a function.。我的解决方案是:jest.mock('nodeModulePackage', () => jest.fn(() => {})); 在我的例子中,我只需要覆盖函数并让它返回一个空对象。
constmyMockFn=jest.fn(cb=>cb(null,true));myMockFn((err,val)=>console.log(val));// > true 当您需要定义从另一个模块创建的模拟函数的默认实现时,mockImplementation方法非常有用: // foo.jsmodule.exports=function(){// some implementation;};// test.jsjest.mock('../foo');// this happens...
// __mocks__/fs.js```'use strict'; const path = require('path'); const fs = jest.genMockFromModule('fs'); // This is a custom function that can be used by our tests during setup to specify // what the files on the "mock" filesystem needs to look like when any of the /...
jest.mock('some-module');test('mocking a function', () => { const mockFunction = jest.fn();const result = mockFunction();expect(result).toBe(someValue);});4. 使用 async/await 进行异步测试 Jest 同样支持异步测试。使用 async/await 进行样本测试。javascript test('an async test', async (...
One common scenario where we may need to mock a static function is when following the Factory Design Pattern to create a new object as follows: Copy export class PersonFactory { private static _instance: IPerson; static getInstance(name: string, age: number): IPerson { if (!PersonFactory._...
🐛 Bug Report In an ES module Node project, with no Babel, jest.mock works when the mocked module is a node_modules package that exports CommonJS, but it isn't working for me mocking an ES module exported from a file in the same project. ...
function add(a, b) { return a + b; } function minus(a, b) { return a + b; } function multiply(a, b) { return a * b; } module.exports = { add, minus, multiply } 在math.test.js文件中引入要测试方法,代码如下:const math = require('./math.js'); const { add, minus } =...