比如你要测试某个class中的某个方法,而这个方法又依赖了外部的一些接口的实现,从单元测试的角度来说我只关心我测试的方法的内部逻辑,我并不关注与当前class本身依赖的实现,所以我们通常会Mock掉依赖接口的返回,因为我们的测试重点在于特定的方法,所以在Jest中同样提供了Mock的功能,本节主要介绍Jest的Mock Function的功...
Optionally you can provide a name for your mock functions, this will be displayed instead of "jest.fn()" in test error output. You should use this if you want to be able to quickly identify the mock function reporting an error in your test output. const myMockFn = jest .fn() .mock...
constmyObj={myMethod:jest.fn().mockReturnThis(),};// is the same asconstotherObj={myMethod:jest.fn(function()
constmyObj={myMethod:jest.fn().mockReturnThis(),};// is the same asconstotherObj={myMethod:jest.fn(function(){returnthis;}),}; Mock 名称 You can optionally provide a name for your mock functions, which will be displayed instead of "jest.fn()" in test error output. Use this if y...
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'; ...
test('async test',async() => {constasyncMock = jest.fn().mockRejectedValue(newError('Async error'));awaitasyncMock();// throws "Async error"}); 为了测试错误是否被抛出,可以使用https://eloquentcode.com/expect-a-function-to-throw-an-exception-in-jest ...
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 ...
我们首先使用jest.fn()来mock axios,并传递到MyComponent中。接着我们使用axios.get.mockResolvedValueOnce()来设置axios的返回值。因为axios.get()是异步函数,所以我们需要使用await flushPromises()来等待异步操作完成。最后我们使用wrapper对象来断言组件的渲染结果是否正确。通过这种方式,我们就能够很方便地进行单元测试...
for enzyme's mount function. * @function createElement - Creates a wrapper around passed in ...
testSubject.test.js import testSubject from './testSubject'; const mockFunction = jest.fn(() => 2) jest.mock('./myClass', () => () => ({ name: 'Name', methodOne: mockFunction, methodTwo: jest.fn(), })) describe('MyClass tests', () => { it('test one', () => { ...