npm-mirror is a utility for mirroring a subset of npm packages from another npm registry. It syncs all of the dependencies for a particular node module and writes them to the local filesystem so that a simple webserver can behave like a commonjs compliant package registry. make test runs the test suite. Unit tests live in test/unit and integration tests live in test/integration. In order for the integration tests to run successfully, you must be connected to the Internet since packages will be downloaded from http://registry.npmjs.org.