Inside of your test suite: functionToMock.mockImplementation(() => ({ mockedValue: 2 }));There is a lot going on here, so let’s break it down. In step 1, we use jest.mock("@module/api", ...) to mock the entire module. This means that every import from the module will be...
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。
// foo.jsmodule.exports=function(){// some implementation;};// test.jsjest.mock('../foo');// this happens automatically with automockingconstfoo=require('../foo');// foo is a mock functionfoo.mockImplementation(()=>42);foo();// > 42 当您需要重新创建模拟函数的复杂行为,以便多个函数...
这是由于jest试图使用的模拟fs。每次测试后需要restore原始fs
简介:Jest模拟函数Mock Function部分模块 在看到Jest模拟函数的那部分的时候,发现官方提供了一种模拟部分依赖的方法,下面看看官方文档给出的例子 // foo-bar-baz.jsexport const foo = 'foo';export const bar = () => 'bar';export default () => 'baz'; ...
使用jest.fn()创建 mock 函数注入到 React props 中,或者直接注入到任何正在测试的函数中。如: constclickFn=jest.fn();constcomponent=shallow(<MyComponentonClick={clickFn}/>);// orfunction(arg1,arg2,clickFn); 这非常有用,可以在声明 mock 函数时直接指定返回值,也可以使用API(如.mockReturnValueOnce(...
importSoundPlayerConsumerfrom'./sound-player-consumer';importSoundPlayerfrom'./sound-player';// What can I pass as the second arg here that will// allow all of the tests below to pass?jest.mock('./sound-player',function() {return{default:function() {return{playSoundFile: jest.fn() ...
FileDescription 01_no_mock_implementation.ts Shows how jest.mock('<module_name'>) immediately mocks any exported object 02_mock_default_export.ts All exported objects from cross-fetch are mocked. An implementation is only defined for the default exported fetch function 03_mock_named_export.ts Al...
import video from './video'; test('plays video', () => { const spy = jest.spyOn(video, 'play'); video.play(); expect(spy).toHaveBeenCalledTimes(1); }); view raw Any call to video.play, either in this test file or (if the function is being called as a side-effect) in so...
在覆盖mock的it块中，调用app.close()并在调用实际的function-under-test/expect之前重新初始化app ...