Head-to-Head: Jest vs Mocha Analysis

jest

v29.7.0(9 months ago)

This package is actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 4Monthly npm downloads

Jest is a delightful JavaScript testing framework with a focus on simplicity and ease of use. It is widely used for testing JavaScript code, including React applications, Node.js projects, and more. Jest provides a zero-configuration setup, making it easy to get started with testing right away. It offers features like snapshot testing, mocking, code coverage, and parallel test execution.

Alternatives:
mocha+
chai+
jasmine+
ava+
tape+
cypress+
playwright-test+
vitest+
qunit+
karma+

Tags: javascripttestingframeworkjestmocking

mocha

v10.4.0(about 2 months ago)

This package is actively maintained.Types definitions are provided via a separate npm package: @types/mochaNumber of direct dependencies: 20Monthly npm downloads

Mocha is a feature-rich JavaScript test framework for Node.js and browsers, offering a flexible and developer-friendly testing experience. It supports various testing styles like BDD, TDD, and more, allowing developers to write tests in a way that suits their preferences. Mocha provides a simple and intuitive syntax for organizing test suites and assertions, making it easy to write and maintain test cases.

Alternatives:
jest+
jasmine+
ava+
chai+
tape+
qunit+
jest-circus+
karma+
cypress+
vitest+

Tags: javascripttestingframeworkNode.jsbrowser

Fight!

Popularity

Both Jest and Mocha are popular testing frameworks in the JavaScript community. Jest gained popularity due to its simplicity and integrated tooling, while Mocha is known for its flexibility and customizability. Both packages have a large user base and are widely used.

Ease of Use

Jest is known for its ease of use and quick setup. It has a zero-configuration approach and provides built-in mocking, assertion libraries, and code coverage. Mocha, on the other hand, requires more configuration and additional libraries to achieve similar functionality. However, Mocha's flexibility allows developers to customize their testing environment according to their specific needs.

Community and Ecosystem

Both Jest and Mocha have active communities with a wide range of plugins and extensions available. Jest, being more popular, has a larger ecosystem of libraries and tools built around it, making it easier to find community support and resources. Mocha also has a strong ecosystem, but it might require additional setup and configuration to achieve certain functionalities compared to Jest.

Performance

Jest comes with built-in parallel test execution and optimized test running, which can provide faster test execution times. Mocha, on the other hand, relies on third-party libraries for parallel test execution and may require additional configuration to achieve optimal performance.

Flexibility

Mocha is known for its flexibility and allows developers to choose their own assertion libraries, mocking libraries, and other testing tools. This gives developers more control over their testing setup but also requires more configuration and decision-making. Jest, on the other hand, provides a more opinionated approach with built-in libraries and tools, which can be beneficial for those who prefer a streamlined testing experience without much configuration.

Integration and Tooling

Jest provides out-of-the-box integration with popular JavaScript frameworks like React, Vue, and Angular and comes with built-in support for snapshot testing. It also provides features like watch mode and code coverage without additional configuration. Mocha, being a more bare-bones framework, requires additional tools and libraries for similar integrations and functionalities.