jest-environment-jsdom
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Package description
The jest-environment-jsdom package is a custom environment for Jest that allows you to simulate a browser-like environment using jsdom. This is useful for testing web applications without running them in an actual browser. It provides a simulated DOM API that you can interact with in your tests.
Simulating browser environment for testing
This feature allows you to simulate browser-like interactions such as clicking a button and then asserting the expected outcome, all within a Node.js environment.
test('simulates a click event', () => {
document.body.innerHTML = '<button id="button">Click me</button>';
const button = document.getElementById('button');
button.addEventListener('click', () => {
button.innerHTML = 'Clicked';
});
button.click();
expect(button.innerHTML).toBe('Clicked');
});Testing DOM manipulation
You can test DOM manipulation by creating, modifying, and removing elements, and then asserting that these changes have taken place as expected.
test('adds a new div to the body', () => {
const div = document.createElement('div');
div.id = 'new-div';
document.body.appendChild(div);
expect(document.getElementById('new-div')).not.toBeNull();
});Mocking global variables
The package allows you to mock global variables such as localStorage, which is useful for testing code that interacts with browser APIs that are not available in Node.js.
test('mocks a global variable', () => {
global.localStorage = {
getItem: jest.fn().mockReturnValue('mockValue')
};
expect(global.localStorage.getItem('key')).toBe('mockValue');
});This package is similar to jest-environment-jsdom but is intended for testing Node.js applications. It does not simulate a browser environment and is therefore not suitable for testing browser-specific code.
Karma is a test runner that works with any framework and allows you to run tests in real browsers. Unlike jest-environment-jsdom, which simulates a browser environment, Karma actually runs tests in real browsers, which can be more accurate but also slower and more complex to set up.
This package integrates jsdom with Mocha, another testing framework. It provides similar functionality to jest-environment-jsdom but is designed to work with Mocha instead of Jest.
Enzyme is a testing utility for React that makes it easier to assert, manipulate, and traverse your React Components' output. It can be used in conjunction with jest-environment-jsdom to test React components in a simulated browser environment.
Changelog
jest-cli 11.0.0, babel-jest 11.0.0 (pre-releases 0.9 to 0.10)
testRunner: "jasmine1" into your configuration.jest-util, jest-mock, jest-jasmine1, jest-jasmine2, jest-environment-node, jest-environment-jsdom packages.babel-jest-preset and babel-jest as packages. babel-jest is now being auto-detected.babel-plugin-jest-hoist which hoists jest.unmock, jest.mock and the new jest.enableAutomock and jest.disableAutomock API.babel-jest integration and react-native testing.babel-jest.jest.mock('moduleName', moduleFactory) feature. jest.mock now gets hoisted by default. jest.doMock was added to explicitly mock a module without the hoisting feature of babel-jest.--watch.--watch.--watch will now only runs tests related to changed files. --watch=all can be used to run all tests on file system changes.--watch re-runs to not trigger test runs during a branch switch in version control.jest.fn() and jest.fn(implementation) as convenient shortcuts for jest.genMockFunction() and jest.genMockFunction().mockImplementation().automock option to turn off automocking globally.process.NODE_ENV to test unless otherwise specified.moduleNameMapper config option when used with paths.throw 'string errors'.--onlyChanged option.toBeCalled Jasmine 2 custom matcher messages.xit and xdescribe.preprocessCachingDisabled config option.testEnvironment option to customize the sandbox environment.@scoped/name npm packages.FAQs
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We found that jest-environment-jsdom demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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