![]() Once this is done, you should have all the Pester commands available to you. Installing Pester Creating a Pester test ^ Find-Module –Name Pester | Install-Module #Pester powershell install#The easiest way is to use PowerShellGet, using the Find-Module command to retrieve the Pester module from the PowerShell Gallery and then Install-Module to actually install it. Pester comes as a PowerShell module that can be obtained through a couple different methods. ![]() That being said, let’s get started with Pester, which we'll first need to download. We'll go more into this breakdown on unit versus integration testing in a future post. An acceptance test doesn’t care if the file’s there or not it cares about whether the service using the file is responding as expected.Įven though Pester is a unit testing framework (and that's what the focus of this article is), it can be adapted to run other testing "layers" as well. An acceptance test would examine the final outcome of that process. Perhaps you were creating a configuration file for an IIS server or were placing a file in a certain location for another process to pick up. There had to have been a reason behind it. Acceptance testing ensures that the end result your customer cares about is how you expect it to be.įor example, I'm assuming you didn't just create that file for fun. Acceptance testing takes things to another level by testing not only if an environmental changed happened but also the expected effect that change has. Acceptance (validation) testsįor the final "testing" layer, we have acceptance testing. When you bring the environment as a whole into the mix, you could run into things like permission problems, servers being offline, things not existing despite you thinking they would, and many other unforeseen problems. #Pester powershell code#For instance, if a unit test confirms that your code is designed to create a file, it doesn’t necessarily mean the script won't fail at doing so. Integration tests are obviously necessary as it’s important to confirm whether your expected change actually happened. ![]() Because integration tests interface with other systems, they are always slower than unit tests. They reach out to the storage system and confirm if an actual file was created in the right place. Integration tests actually confirm whether the environment was changed. Integration tests are the next layer of testing. A unit test would confirm if your script called Add-Content had a Path argument of C:\CorrectFile.txt, for example, rather than C:\WrongFolder\WrongFilePath.txt however, it wouldn't actually create the file through a concept called mocking which will be covered in another post. Instead, it would test if your code was designed to create the file in the expected place. Unit tests have no environmental dependencies and can be executed anywhere without fear of actually changing anything.įor example, if you had a script that created a file, a unit test shouldn't test whether the file was actually created. They are written to confirm whether the logic of the corresponding unit executes as you'd expect it to. Unit tests aim to test units of code, such as functions, in your project. Each layer is unique, which makes each type of test different. #Pester powershell software#Software is typically tested in layers: unit, integration, and acceptance (validation). This is important and will soon become evident as you create more tests in Pester. You might not think anything of this snippet, but notice that it doesn’t simply say “tests” and instead gives the test a category: unit. Pester's Github readme defines the project as "…a framework for running unit tests.". ![]() Testing "layers" ^īefore we get too far into Pester itself, it's important to take a step back and talk about the various "layers" of testing you might see floating around. I’m a PowerShell developer, and at this point, it’s time to get serious and to start investing in testing. I check my code into source control, collaborate with others on my code, and am involved in the occasional releases of our automation platform to customers. ![]() I’m a Senior Systems Automation Engineer, and I write PowerShell all day, every day. Fast forward to 2016, where you now have classes, robust debugging support, and a community dedicated to taking PowerShell from being treated just as a scripting language to being acknowledged as a development language. ![]()
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