Mocha

Mocha is a feature-rich JavaScript test framework that runs on both Node.js and in the browser, designed to make asynchronous testing simple and enjoyable. It executes tests serially by default, which ensures flexible and accurate reporting while correctly mapping uncaught exceptions to their corresponding test cases. This structure provides a reliable foundation for building robust test suites.

The framework offers a wide array of features to accommodate various testing needs:

• Versatile Async Support: Easily handle asynchronous operations with first-class support for callbacks, Promises, and modern async/await syntax.
• Choice of Interfaces: Choose your preferred testing style with interfaces like BDD (describe(), it()) and TDD (suite(), test()).
• Powerful Hooks: Use before(), after(), beforeEach(), and afterEach() to set up preconditions and perform cleanup tasks for your tests.
• Assertion Agnostic: Bring your own assertion library. Mocha works seamlessly with Chai, Expect.js, Should.js, and any other library that throws an Error.
• Parallel Testing: Speed up your test runs significantly by executing test files in a parallel worker pool.
• Rich Reporting: Select from a wide range of built-in reporters or use third-party options to visualize test results.