![]() The second one is when the function works correctly, but the test is incorrect.The first was that the tested function did not work correctly, this is a good way to break the test.If you look closer on how we broke the test, you can see that there are two distinct ways to break it. ![]() The error is: Expected 1, but got 8., this again reflects exactly what we did in the test, but it no longer reflects the real world. This is the output you should see in the console: To install Pester it is usually enough to just do Install-Module Pester -Force. Pester can produce artifacts such as Test Results file and can be used for generatingĬode Coverage and Test Result files for reporting Pester contains a powerful set of Mocking capabilities that allow tests to replace the behavior of anyĬommand inside of a piece of PowerShell code being tested. ![]() With Visual Studio Code, and it can of course be integrated into a build script in a CI pipeline. Pester can be run locally, where it integrates well Includes functions, Cmdlets, Modules and scripts. Pester tests can execute any command or script that is accessible to a Pester test file. Pester follows a file naming convention *.Tests.ps1, and uses a simple set of functions:ĭescribe, Context, It, Should and Mock to create a mini-DSL for writing your tests. ![]() It is also a base for tools that validate whole environments, computer deployments, database configurations and so on. Used for writing unit and integration tests, but it is not limited to just that. Pester provides a framework for writing and running tests. Pester is a testing and mocking framework for PowerShell. My next step was to examine the services running on the infrastructure servers and note down the display name and name of each service.Tl dr: Here is a summary. So, what did I do to get started with Pester?Īs stated I watched the video on youtube and then I found this post by Adam Bertram: Īfter that I made a list over the infrastructure roles I wanted to test, my list looks like this: Writing a Pester test isn’t that hard and doesn’t take much time, but finding out what to test and how to test it can take a bit of time. You can read more about Pester here: Īfter watching the video from Rob I started right away on building my Pester tests so much of my evenings this week has gone with this. This force you to think about what you want to achieve and create the tests for it before you write the code doing it. If you really want to dig into PowerShell coding you should start with writing your Pester tests and then your PowerShell code afterwards. Of course, there is more to the OAT but I won’t look into that is this post.įor those of you that has never heard about Pester it is basically a “tool” that will test your PowerShell code and alert you of anything in the code that doesn’t behave as you intend. After watching a youtube video from ( I was inspired to use Pester as the base for doing the infrastructure server tests. For this project with need to hand in an operational acceptance test (OAT) and part of that is showing that the infrastructure is working as expected. I am currently working on a project where we are building a new XenApp 6.5 environment (Yes, we know it’s not the best idea, but there are reasons).
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