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jest

Delightful JavaScript Testing.

    29.7.0latest
    GitHub
    npm

Version published
Maintainers
3
Weekly downloads
22,162,213
decreased by-0.6%

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Package description

What is jest?

The @types/jest package provides TypeScript type definitions for Jest, a popular JavaScript testing framework. This allows developers to use Jest in TypeScript projects with type checking and IntelliSense support for Jest's API.

What are jest's main functionalities?

Type Definitions for Jest Functions

Provides type definitions for Jest's global functions like 'test' and 'expect', enabling type checking and autocompletion in TypeScript.

test('adds 1 + 2 to equal 3', () => {
  expect(1 + 2).toBe(3);
});

Type Definitions for Matchers

Includes type definitions for Jest's matchers, such as 'toMatch', 'toBe', and 'toHaveProperty', ensuring correct usage with TypeScript.

expect('hello').toMatch(/hello/);

Type Definitions for Mock Functions

Provides type definitions for Jest's mock functions and their methods like 'mockReturnValue' and 'mockImplementation'.

const mockFunction = jest.fn();
mockFunction.mockReturnValue('default value');

Type Definitions for Jest Configuration

Offers type definitions for Jest configuration options, which can be used when setting up Jest in a TypeScript project.

const jestConfig = {
  verbose: true,
  collectCoverage: true
};

Other packages similar to jest

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)

Readme

Source

Jest

🃏 Delightful JavaScript Testing

  • 👩🏻‍💻 Developer Ready: Complete and ready to set-up JavaScript testing solution. Works out of the box for any React project.

  • 🏃🏽 Instant Feedback: Failed tests run first. Fast interactive mode can switch between running all tests or only test files related to changed files.

  • 📸 Snapshot Testing: Jest can capture snapshots of React trees or other serializable values to simplify UI testing.

Read More: https://jestjs.io/

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Last updated on 12 Sep 2023

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