Testing your PowerShell code with Pester - Florin Loghiade

As Infrastructure as Code is growing more in popularity, system administrators and devs started writing more and more sophisticated systems code and scripts. Testing code is something that devs have been doing this for a long time while system administrators just started adopting the idea. With the growing popularity of PowerShell, more and more system administrators and devs began to write PowerShell code for provisioning and configuring infrastructure either on-premises or in the cloud, but the biggest problem was that there was no useful framework to test that code when a breaking change occurred. This is the concept of “I ran it, and it worked,” did it now? Enter Pester. Pester is a unit testing framework for PowerShell. It provides a few simple-to-use keywords that let you create tests for your scripts. Pester implements a test drive to isolate your test files, and it can replace almost any command in PowerShell with your implementation. This makes it an excellent framework for both Black-box and White-box testing. In this presentation, you will learn what Pester is, how you can use pester as your daily driver when you’re writing scripts and how you can use Pester to make your life better when change happens.