We have the tests representing the creation of the VM, tests representing the set up of Active Directory on that VM and tests to confirm Active Directory is populated with the expected objects. Notice that we have three “levels” of tests. It is also a base for tools that validate whole environments, computer deployments, database configurations and so on. Pester is most commonly used for writing unit and integration tests, but it is not limited to just that. Below I’ve created some dummy tests to give you an example of how a typical infrastructure test may be created. Pester provides a framework for writing and running tests. As an extreme example, consider this test. You’d like to create some Pester tests for this scenario using tags.įirst, you’d create some Pester tests using the familiar describe/it block syntax. The Describe, Context and It keywords might look like a static DSL, but theyre actually just PowerShell cmdlets that take a string and a script block as a parameter - the tests themselves are only 'materialized' (for want of a better word) when the script runs.
PESTER TEST WINDOWS
Let’s say you’ve confirmed that when a virtual machine called TEST-DC is online, that VM should have the AD-Domain-Services Windows feature installed and it should have a user called ‘abertram’ and a user called ‘dtrump’ created in that domain.
PESTER TEST HOW TO
Related: How To Create An Azure DevTest Lab Seeing Pester Tags In Action The important point is that you have one or more environmental states you’d like to confirm.
This script creates a virtual machine, installs a Windows feature, and creates a few Active Directory users. Perhaps you’ve got a PowerShell script that is supposed to create a new testing lab. To demonstrate, let’s say that you’ve got a Pester test that tests the state of a Windows server.
PESTER TEST CODE
It allows not just developers to create reliable, tested code in PowerShell. Most unit testing frameworks, including Pester, come with a way to call the same test function multiple times with different parameters, allowing the code to become even shorter. Pester, if you’re not familiar, is the de-facto unit-testing framework for PowerShell. The only difference between the tests are the parameters that they pass to the function. Tags allow a developer to manage large test suites that may take hours to run by only executing certain tests matching certain tags. A tag allows a developer to organize their tests based on different criteria and execute those tests accordingly. Assuming we are using the Pester version 4.0.
Concretely, custom assertions means that we can plug additional operators into Pester’s assertion function : Should. However, this command is now considered legacy and will be removed from future versions Pester. Also, I really like the idea that test scripts can act as an executable (potentially business-readable) specification. Pester provides a command called New-Fixture that scaffolds out a single PowerShell script and test file to work with. One of Pester’s useful features is the Tags feature. In your PowerShell console with Pester installed, you can quickly create a simple project.
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