Some features of this testing framework are: * Easy Setup: Jest is a complete and easy to set up JavaScript testing solution. In fact, Jest works out of the box for any React project. * Instant Feedback: Failed tests run first. Fast interactive mode can switch between running all tests or only test files related to changed files. * Snapshot Testing: Jest can capture snapshots of React trees or other serializable values to simplify UI testing.

Node.js is an event-based server-side JavaScript engine.