Pester is a powerful tool for automating your testing in PowerShell scripts. As we transition into a DevOps-oriented world, it becomes crucial to ensure the reliability of your scripts. No one wants a broken script running in a production environment. Even if you test your script initially, modifications or unique conditions might arise that require retesting. This chapter will delve into automated unit testing for PowerShell scripts using Pester.
- You write some code or modify some old code.
- You check your code into a source control repository.
- The repository triggers a continuous integration pipeline. Usually incorporating third-party tools, the pipeline builds a virtual machine to test your script. The pipeline copies your script into the virtual machine and runs several automated tests. If the tests fail, you get an email telling you what happened.
- If the tests pass, your code is deployed to a deployment repository (maybe PowerShellGallery.com or a private repository), making it available for production.