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jest-environment-node

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jest-environment-node

    29.7.0latest
    GitHub
    npm

Version published
Maintainers
3
Weekly downloads
19,959,008
decreased by-12.91%

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Package description

What is jest-environment-node?

The jest-environment-node npm package is a test environment for Jest that simulates a Node.js environment. It is used when testing Node.js specific code. It provides a global environment that's set up for each test file to be executed in a Node-like environment, with all the necessary globals like `process` and `Buffer` available.

What are jest-environment-node's main functionalities?

Simulating Node.js Environment

This configuration in Jest's setup file tells Jest to use the Node environment for testing. It is useful when you want to test code that relies on Node.js APIs.

module.exports = { testEnvironment: 'jest-environment-node' };

Global Setup and Teardown

This feature allows you to extend the Node environment to add custom setup and teardown logic that runs before and after each test suite.

class CustomEnvironment extends NodeEnvironment {
  async setup() {
    await super.setup();
    // Your setup code here
  }

  async teardown() {
    // Your teardown code here
    await super.teardown();
  }
}

Custom Module Mocking

In a Node environment, you can mock Node modules like 'fs' to control their behavior during tests, which is useful for testing code that interacts with the filesystem without actually reading or writing files.

jest.mock('fs', () => ({
  readFileSync: jest.fn().mockReturnValue('mocked content'),
}));

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Changelog

Source

29.7.0

Features

  • [create-jest] Add npm init / yarn create initialiser for Jest projects (#14465)
  • [jest-validate] Allow deprecation warnings for unknown options (#14499)

Fixes

  • [jest-resolver] Replace unmatched capture groups in moduleNameMapper with empty string instead of undefined (#14507)
  • [jest-snapshot] Allow for strings as well as template literals in inline snapshots (#14465)
  • [@jest/test-sequencer] Calculate test runtime if perStats.duration is missing (#14473)

Performance

  • [@jest/create-cache-key-function] Cache access of NODE_ENV and BABEL_ENV (#14455)

Chore & Maintenance

  • [jest-cli] Move internal config initialisation logic to the create-jest package (#14465)

FAQs

Last updated on 12 Sep 2023

Did you know?

Socket installs a GitHub app to automatically flag issues on every pull request and report the health of your dependencies. Find out what is inside your node modules and prevent malicious activity before you update the dependencies.

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