asynchronous BDD & continuous integration for Node Node is an event-based server-side JavaScript engine. Vows is a behavior driven development (BDD) framework for Node. Vows was built from the ground up to test asynchronous code. It executes your tests in parallel when it makes sense, and sequentially when there are dependencies. Emphasis was put on speed of execution, clarity and user experience. This package contains the vows library for Node, and the script vows for running tests from the commandline.