test-machinepack is a lightweight command‑line utility that runs raw JSON/JSON5 test specifications for “machinepacks” – reusable Node.js modules built with the machine spec (see node-machine.org). It provides a very basic generic test driver (invoked via `testmachinepack`) and serves as a reference point for creating custom drivers, such as the more feature‑rich Mocha driver in a companion repo. The tool is aimed at developers who write or maintain machinepacks and need a simple way to validate their machines against declarative test cases.