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Questions tagged [pester]

Pester is a unit test framework for PowerShell. It provides a domain specific language that allows you to define test cases. It is also used to perform operational/infrastructure testing and this is encouraged by Microsoft who leverage Pester as part of the Operation Validation Framework project.

Per the Pester project page:

Pester provides a framework for running unit tests to execute and validate PowerShell commands from within PowerShell. Pester consists of a simple set of functions that expose a testing domain-specific language (DSL) for isolating, running, evaluating and reporting the results of PowerShell commands.

See

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How to do TDD and unit testing in powershell?

With MS ramming powershell into all new server products, I'm starting to (reluctantly) think I need to take it seriously. Part of "taking it seriously" is TDD. Have you found good methods to unit test power shell scripts? I've found samples of…
Precipitous
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Determine if an array of PSCustomObject's contains an instance with a property value

I need to determine if an array of PSCustomObjects contains an item with its Title property matching a value. I need a Boolean value for use with Pester assertions: $Items - $Name | Should Be $True Assuming: $Items = @() $Items +=…
craig
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Pester sample script gets "-Be is not a valid Should operator" on Windows 10, works fine on Ubuntu

New to Pester, installed Powershell and Pester on Ubuntu 16.04 per instructions on the Pester Github page https://github.com/pester/Pester. Executed their sample scripts Get-Planet.Tests.ps1 and Get-Planet.ps1 and it worked as advertised. Tried the…
Dave Nicolette
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Can Pester mock an exception?

I'm working on some Pester test cases and I'm looking at the CodeCoverage results. In most sets of test cases where we the code contains a try/catch we get 0% coverage on the catch. Here's an example: function Test-Is64Bit() { $Result =…
Dave Wiard
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How to mock a call to an exe file with Pester?

Developing a script in PowerShell, I require to call an external executable file(.exe). currently I am developing this script with a TDD approach, therefore I require to mock the called to this .exe file. I try this : Describe "Create-NewObject" { …
XtianGIS
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Testing for mandatory parameters with Pester

I'm trying to figure out how to have Pester test for parameters that are missing: Find-Waldo.Tests.ps1 $here = Split-Path -Parent $MyInvocation.MyCommand.Path $sut = (Split-Path -Leaf $MyInvocation.MyCommand.Path) -replace '\.Tests\.', '.' Describe…
DarkLite1
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Is there a way to test / assert output from Write-Host using Pester?

I'm writing tests for a fairly complex script and there's one particular function in the script that will output different series of logging messages to the user. I would like to assert whether a particular logging message is being displayed. The…
Zam
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How to mock a job in Pester?

We're trying to assess if Invoke-Command has been called exactly one time. Script.ps1 $job = Invoke-Command -ScriptBlock {'test'} -ComputerName localhost -AsJob $job | Wait-Job Script.Tests.ps1 BeforeAll { $testScript =…
DarkLite1
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Pester mock method for Powershell 5 class

I am having an issue trying to mock a powershell 5 class method, when executing the test, I get the error " CommandNotFoundException: Could not find Command FunctionToMock". I am trying to unit test the "OutputToOverwrite" method by mocking…
BenoitM
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How can I user a parameterFilter with a switch parameter when mocking in Pester?

Using Pester, I'm mocking an advanced function which takes, amongst other parameters, a switch. How do I create a -parameterFilter for the mock which includes the switch parameter? I've tried: -parameterFilter { $Domain -eq 'MyDomain' -and $Verbose…
Simon
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Anyone's using BDD in Powershell?

I've found a lot of threads around this question here at stackoverflow. They are 2 years old now. So I would like to know if someone is using scottmuc functions to perform a BDD in powershell. It seems very powerful at first sight. What's your…
Emiliano Poggi
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Access External Variable from with-in Mock Script Block (Pester)

Pretend I have a function like... function Get-Something { return Get-DogShit } ...in my Pester test script... $var = 1 Mock 'Get-Dogshit' { return $var } it 'should return true' { Get-Something | should $var } This doesn't work, but you see…
Adam
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Pester doesn't catch the thrown error

When I run the following pester test I expect it to catch the expected error but it doesn't. But when I run the test with a different function with a different throw statement it works. Pester Test: Describe "Remove-GenericCredential Function…
Keith
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Unit Testing frameworks for Powershell

There was a question asked 3 years ago about Powershell Unit Testing Frameworks, How to do TDD and unit testing in powershell?, and all the frameworks were quite new at that moment: PSUnit: http://www.psunit.org/ Pester:…
Josep
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How can I get the numer of failed tests from Invoke-Pester?

I have a few Pester tests running fine in the console, but I would like to run the tests automatically and send a message if any test fails. I read the option -EnableExit causes Invoke-Pester to return the numer of failed tests. But whenever I use…
Stefan Wilms
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