instead of Jest or similar popular libraries, node.js has embedded feature for running unit test
Test runner | Node.js v22.1.0 Documentation
Exploring the Node.js native test runner - LogRocket Blog
While some programming languages incorporate testing tools to the core language feature, this wasn’t the case in the JavaScript/Node.js ecosystem. Tools like Mocha, Jest, and Jasmine were created to help with elaborate testing mechanisms. A native test runner was added as an experimental feature to Node.js v18, and fully incorporated into the Node.js core in version 20.Is NodeJS Test Runner “Dev-Ready”? - DEV Community
Node.js — Using Node.js's test runner
example of "AI" generating unit tests:
Course: GitHub Copilot - The Complete Guide | Udemy Business
