teenytest is a tiny, zero‑configuration test runner for Node.js that discovers test files (by default under `test/lib/**/*.js`) and executes exported functions or objects of functions, supporting simple hooks, nested suites, and async tests via callbacks (or plugins for promises). It’s aimed at JavaScript developers who want a minimal‑setup, TAP‑compatible runner that works straight from the CLI or an npm script without any testing API or boiler‑plate.