Pester

Now, it's time to visit another PowerShell utility called Pester. Pester helps in defining and executing tests on PowerShell scripts, functions, and modules. These could be unit tests, integration tests, or operational validation tests. Pester is an open source utility freely downloadable from GitHub as a PowerShell module. It is also available out-of-the-box on Windows 10. We will use Pester to define unit tests and operational validation tests and also execute them in continuous integration build pipelines and continuous deployment release pipelines in this book. As of writing this book, Pester 3.0 is the latest stable version available for download and the same is used.

Pester helps in defining unit tests in a simple English style language using simple constructs like Describe and It and validates them through assertions. Pester can be downloaded as a ZIP file from https://github.com/pester/pester/archive/master.zip. After downloading, the ZIP file should be unblocked and its content...