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Pester test examples5/16/2023 ![]() The test is done directly inside a Pester code block not using a function like I did previously.Ĭheck that my Windows Server Power Plan is set to High Performance. Your environment changes frequently and you need to be sure that your infrastructure is aligned with your standard. Pester is often used by sysadmin to do infrastructure testing. For example, using a Pester context block, you can define specific states the server is in before running the test. What is great is all the details (in red color) we can get when a test fails. I set the expected value that I should get and I compare it to the actual value returned by the function. Many more are available like -BeFalse, -BeGreaterOrEqual, -BeLike, -Contain, etc. If the assertion is not met the test fails and an exception is thrown up. The It block should have an expressive phrase describing the expected test outcome.įinally, the Should command defines the test condition to be met. The It block is the one that actually contains the test. They are optional and are useful to organize your test code. You will often have one Describe block for each function you want to test.Ĭontext blocks are like Describe, they contain It blocks. The main commands with Pester are Describe, It, Context, and Should.ĭescribe is a block that contains tests. But there is a really specific problem in PowerShell 2.0 that might make your tests act strangely. The tests will fail when there are any best practice violations with the. Pester is PowerShell 2.0 compatible and as long as PowerShell 2.0 will be relevant Pester will support it. You can ignore the first 3 rows in the Tests file, they came from the New-Fixture function and just dot sources the function to test into the PowerShell session. This will execute the Pester tests in the file above on the specified ARM template. Pester is very declarative and easy to read. This is a very basic function that reverses the string characters. Let’s say I want to write a Pester test for the following PowerShell function. TOPIC Pester tests can execute any command or script that is accessible to a CREATING A PESTER TEST C:PS>New-Fixture deploy Clean Creates two files: It. 15 Describe, Context, and It Describe a group of API specific tests. I will now show you a very basic Pester test. 14 The It Block This is where you run a specific test One set. You need to use the following command to get the latest version: PS C:\> Install-Module -Name Pester -Force -SkipPublisherCheckĥ.1.0 Pester PSGallery Pester provides a framework for. ![]() If you have the 3.4 version installed and would like to update it you will face errors with Update-Module. The latest version is available in the PSGallery. ![]() Pester is shipped by default with Windows 10 and Windows Server 2016. In this blog post, I’ll do a short introduction to Pester with Installation and basic checks examples. Pester is used for example to test PowerShell Core and Pester itself. It’s a framework for writing and running unit tests, integration tests, and also infrastructure checks as we will see in a moment. If you never heard of it, Pester is a PowerShell module, written in PowerShell. ![]()
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