Let’s say you have a PowerShell function that creates a file only if that file doesn’t already exist. If you’d like to dive deep into mocking and many real-world examples, be sure to check out The Pester Book. If this doesn’t make sense now, hopefully, a brief demonstration will make the light bulb turn on! To follow along with the demo, I will expect you to have a beginner-intermediate level understanding of the Pester testing framework. These three are identical to the ones used in the integration tests, with the exception of the variable names. Next, it checks to see if the file exists, having been leftover from a previous test, and if so delete it. Mocking enables you to set up various scenarios commands inside of your testing “unit” will adhere to figure out what might happen given various circumstances. This example uses the C:\PowerShell\Pester-Demo folder where the scripts reside. Mocking is a feature in Pester that allows you to “replace” commands your “unit” is calling with ones of your own.
#POWERSHELL PESTER EXAMPLES CODE#
One way to ensure unit tests are accurate and unaffected by other code is through a concept called mocking. Unit testing tests individual units of code as one to ensure developers can accurately determine if a single “unit” behaves as expected. When unit testing, it’s essential to ensure your code isn’t influenced in any way by the environment its being run on or by any other outside functions or modules. Pester is a popular unit-testing framework built for PowerShell code that allows you to ensure the code you write is as you expect and stays that way. If you want to ensure your PowerShell code is in tip-top shape, you need to be unit testing it.
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