jest-mock-now

jest-mock-now

Date.now() as deterministic Jest mock function.

Install

➜ ~ yarn add jest-mock-now -D

Usage

It is possible to use the following configurations at every setup level; in a setupJest.js file as well as in a beforeEach or a test function as shown here.

require('jest-mock-now')();

console.log(Date.now()); // 1479427200000

or

const now = new Date('2017-06-22');

require('jest-mock-now')(now);

console.log(Date.now()); // 1498089600000

If you need to restore the original Date.now() method, you can call mockRestore().

Date.now.mockRestore();