Test Kitchen is a self-service tool used for integration testing of Chef Cookbooks and isolating application bugs in a local environment. It allows users to test and debug their application or infrastructure code locally using virtual technologies, converging across various platforms such as CentOS, Ubuntu, Windows, and more. The test environments are defined in a single kitchen.yml file located inside the Chef cookbook source control repository. Test Kitchen uses two virtualization tools - Vagrant and VirtualBox - to deploy these different platforms locally. It also supports multiple Ruby testing frameworks from Bats, Minitest, Rspec, Serverspec, and more.