node.js: native test runner

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:

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