如何使用sinon监视JavaScript中的导出函数调用

Question

这是我试图模拟的实际代码

import {combineReducers} from 'redux'

import user from '../user'

export default combineReducers({
    user
})

我想设置一个测试，以便：

describe('API Reducer', () => {
    it('calls combineReducers om modules', function() {
        const combinedReducerSpy = sinon.spy(...) // <-- UNKNOWN
        sinon.assert.calledWith(combinedReducerSpy, {user})
    });
});

Answer 1

我写了一篇博客，回答了我的问题。 感谢您的帮助！

我今天写了一个JavaScript单元测试...模拟导入时间函数

// reducers.js
import {combineReducers} from 'redux'
import widget from './widget'
export default combineReducers({
    widget
})

// reducers.test.js
import redux from 'redux'
import widget from './widget'

describe('Use jest', () => {
    afterEach(() => {
        jest.resetModules()
    });

    test('first test', () => {
        jest.doMock('redux');

        require('./reducers');
        let {combineReducers} = require('redux');

        expect(combineReducers).toBeCalledWith({"widget": widget})
    });
});