https://github.com/mattiaerre/jest-mock-now

Date.now() as deterministic Jest mock function.
https://github.com/mattiaerre/jest-mock-now

date jest mock now prettier

Last synced: 3 months ago
JSON representation

Date.now() as deterministic Jest mock function.

• Host: GitHub
• URL: https://github.com/mattiaerre/jest-mock-now
• Owner: mattiaerre
• License: mit
• Created: 2017-06-22T15:50:28.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2020-02-25T05:25:24.000Z (almost 5 years ago)
• Last Synced: 2024-09-14T10:55:19.048Z (4 months ago)
• Topics: date, jest, mock, now, prettier
• Language: JavaScript
• Homepage:
• Size: 153 KB
• Stars: 33
• Watchers: 3
• Forks: 7
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE
  • Code of conduct: CODE_OF_CONDUCT.md

Awesome Lists containing this project

README

        
# jest-mock-now

`Date.now()` as deterministic [Jest mock function](https://facebook.github.io/jest/docs/mock-functions.html).

## Install

```bash

➜ ~ npm install --save-dev jest-mock-now

```

## 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](__tests__/index.test.js).

```javascript

const timestamp = require('jest-mock-now')();

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

```

or

```javascript

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

console.log(Date.now()); // 149808960000

```

The `jest-mock-now` function returns the timestamp used to mock the `Date.now` method:

```javascript

const timestamp = require('jest-mock-now')(new Date('2017-06-22'));

console.log(timestamp); // 1498089600000

console.log(Date.now()); // 149808960000

```

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

```javascript

Date.now.mockRestore();

```