Mocha has emerged as one of the most popular choices for unit testing in Node.js. Let's see it in action.

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Mocha is a popular JavaScript test framework used for unit testing in Node.js applications. It supports both Behavior-Driven Development (BDD) and Test-Driven Development (TDD). Mocha allows flexible test suite configuration and the use of any assertion library. With features like intuitive flow of execution, sync and async code testing, and support for parallel execution, Mocha aims to make the testing process efficient and comprehensive. The guide provides a step-by-step tutorial to set up a Node.js project, add Mocha, and write and execute unit tests.

How To Write Unit Tests in Node.js Using Mocha