Pester is the universal mock framework and test framework for PowerShell. Pester tests can be added to Powershell code to improve code quality and allow you to make predictable changes. Visual Studio Code includes full support for Pester, allowing you to quickly create tests. Pester integrates well with TFS, Azure Github, Jenkins and other CI servers, allowing for fully automated development. Pester is a framework that allows you to write and run tests. Pester is used most often to write unit and integration testing, but it's not limited to that. It can also be used to validate whole environments, computer deployments, and database configurations. Pester tests can execute any command and script that is available to a Pester file. This includes functions, Cmdlets and Modules as well as scripts. Pester can be run locally where it integrates well into Visual Studio Code. It can also be integrated into a CI pipeline build script.