When we execute the PowerShell test from the PowerShell IDE console pane we get the following result in the PowerShell Window. When a function is in a file called Something.ps1, the corresponding tests should be in the file 1. Note that Pester strongly nudges the developer to go along with a certain naming pattern for files. We could verify the functionality with the following test:įor PowerShell the same function could look like this:Īnd the corresponding test function looks like this:įrom the structure there is a lot in common. Let’s assume we have the following class we would like to test: Let’s get started by having a look at what we want to do in a C# context.įor the C# samples we will be using the framework which follows the xUnit pattern. I’ll leave it up to you to follow up on the difference between Test Driven Development (TDD) and BDD, for a framework it usually shows in a more human friendly description of the tests. Pester follows a Behavior Driven Development (BDD) test-development style.
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Which is the de facto standard PowerShell testing framework and comes with every installation of Windows 10. PowerShell comes with it’s own testing framework called Pester. This is where automated Testing allows to ensure functional correctness without demanding any great user interaction to execute multiple test scenarios. However the more complex a script becomes or is integrated into long running processes the harder it becomes to ensure that the script is still running as intended after changes. When the Script is small or does not invoke any long running services we can do this quite simply by executing the script.
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Whenever writing code that ends up in production it is always a must to ensure that the code runs as expected. Functions are not only a great way to structure code for reuse but also allow to create larger scripts. functions can be implemented with PowerShell. In the previous post we saw how methods i.e.
PowerShell for the C# developer – Part 4 Testing
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