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jest-environment-node
Advanced tools
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.
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'),
}));
This package is similar to jest-environment-node but is intended for testing web applications by simulating a browser environment using jsdom. It provides a DOM API that can be used in tests.
This package integrates Jest with Puppeteer for end-to-end testing. It sets up a browser environment and allows for testing user interactions with a real browser.
This package is designed for integration with Selenium WebDriver for browser-based testing. It is similar to jest-environment-puppeteer but uses WebDriver API for controlling browsers.
29.1.0
[expect, @jest/expect]
Support type inference for function parameters in CalledWith
assertions (#13268)[expect, @jest/expect]
Infer type of *ReturnedWith
matchers argument (#13278)[@jest/environment, jest-runtime]
Allow jest.requireActual
and jest.requireMock
to take a type argument (#13253)[@jest/environment]
Allow jest.mock
and jest.doMock
to take a type argument (#13254)[@jest/fake-timers]
Add jest.now()
to return the current fake clock time (#13244, #13246)[@jest/mock]
Add withImplementation
method for temporarily overriding a mock (#13281)[expect]
Export toThrow*
matchers (#13328)[jest-circus, jest-jasmine2]
Fix error messages for Node's assert.throes
(#13322)[jest-haste-map]
Remove __proto__
usage (#13256)[jest-mock]
Improve spyOn
typings to handle optional properties (#13247)[jest-mock]
Fix mocking of getters and setters on classes (#13145)[jest-snapshot]
Throw useful error when an array is passed as property matchers (#13263)[jest-snapshot]
Prioritize parser used in the project (#13323)[jest-transform]
Attempt to work around issues with atomic writes on Windows (#11423)FAQs
Unknown package
The npm package jest-environment-node receives a total of 15,199,290 weekly downloads. As such, jest-environment-node popularity was classified as popular.
We found that jest-environment-node demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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