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Node.js: How to mock the imports of an ES6 module

 1 year ago
source link: https://blog.fedecarg.com/2017/07/18/node-js-how-to-mock-the-imports-of-an-es6-module/
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Node.js: How to mock the imports of an ES6 module

Written by Federico

Posted on July 18, 2017March 30, 2018Leave a comment

The package mock-require is useful if you want to mock require statements in Node.js. It has a simple API that allows you to mock anything, from a single exported function to a standard library. Here’s an example:

app/config.js

function init() {
// ...
}
module.exports = init;

app/services/content.js

import config from '../../config.js';
function load() {
// ...
}
module.exports = load;

test/services/content_spec.js

import {assert} from 'chai';
import sinon from 'sinon';
import mockRequire from 'mock-require';
describe('My module', () => {
let module; // module under test
let configMock;
beforeEach(() => {
configMock = {
init: sinon.stub().returns("foo")
};
// mock es6 import (tip: use the same import path)
mockRequire("../../config.js", configMock);
// require es6 module
module = require("../../../app/services/content.js");
});
afterEach(() => {
// remove all registered mocks
mockRequire.stopAll();
});
describe('Initialisation', () => {
it('should have an load function', () => {
assert.isFunction(module.load);
});
});
});

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