imitate the behavior of moment.js in a Node environment by utilizing jest

Is there a way to effectively mock the functionality of moment.js for integration testing purposes? I've attempted to mock it using jest following a guide like this one:

import moment from 'moment'
...
jest.mock('moment', () => () => ({valueOf: () => 100})

However, when running my test, the original moment code is still being used.

I did manage to override moment behavior by utilizing an approach mentioned here. Unfortunately, this method seems to override more functions than necessary, which is not ideal.

javascriptunit-testingjestjsmomentjs

Answer №1

When I need to simulate a moment.js function, my go-to method is using stubs from Sinon.js (https://sinonjs.org/releases/v7.2.7/stubs/).

Here's how it typically looks:

import * as sinon from 'sinon'
import moment from 'moment'
...
const stubValueOf = sinon.stub(moment, 'valueOf');
stubValueOf.returns(100);

Note: When working with stubs, it's best practice to use them only for specific tests rather than the entire test file. After each use, remember to call stubValueOf.restore(). If you need to change the values being "stubbed" within the same test, utilize stubValueOf.reset().

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