Add parameter capitalization guardrail for PowerShell tests by Pitchfork-and-Torch · Pull Request #27677 · PowerShell/PowerShell

Pitchfork-and-Torch · 2026-07-11T21:05:59Z

Summary

Addresses #26614.

Keep test scripts using PascalCase for common parameters (-Force, -ErrorAction, etc.).

Changes

Fixed a few lowercase -force call sites (including the Set-Alias example from the issue)
Added ParameterCapitalization.Tests.ps1 (CI) scanning test/powershell
Allowlisted intentional case-insensitivity fixtures

Testing

Dry-ran the scan over test/powershell after fixes (0 violations outside allowlist).

Fixes a handful of lowercase common parameters (-force, etc.) and adds a CI test so we don't reintroduce them. Intentional case-insensitivity fixtures stay allowlisted. Addresses PowerShell#26614.

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Copilot

Pull request overview

Adds a CI guardrail test to keep common PowerShell parameter switches in test scripts consistently capitalized (PascalCase), and fixes several existing lowercase -force call sites that triggered the issue (#26614).

Changes:

Fixed a handful of lowercase common-parameter usages (e.g., -force → -Force) in existing tests.
Added a new Pester test that scans test/powershell for lowercase common parameters, with an allowlist for intentional fixtures.
Updated one cleanup call site in Encoding.Tests.ps1 to use -Force.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
`test/powershell/Modules/Microsoft.PowerShell.Utility/Get-Alias.Tests.ps1`	Fixes a lowercase `-force` usage in an alias test.
`test/powershell/Modules/Microsoft.PowerShell.Management/Remove-Item.Tests.ps1`	Fixes a lowercase `-force` usage when creating a test file.
`test/powershell/Modules/Microsoft.PowerShell.Management/FileSystem.Tests.ps1`	Normalizes `New-Item` parameter casing (`-ItemType`, `-Path`, `-Force`).
`test/powershell/Modules/Microsoft.PowerShell.Core/PSSessionConfiguration.Tests.ps1`	Fixes lowercase `-force` usages in pending remoting configuration tests.
`test/powershell/engine/Basic/ParameterCapitalization.Tests.ps1`	Introduces the new CI guardrail that scans for lowercase common parameters.
`test/powershell/engine/Basic/Encoding.Tests.ps1`	Fixes lowercase `-force` in test cleanup.

+        $repoRoot = (Resolve-Path (Join-Path $PSScriptRoot "../../..")).Path
+        $scanRoot = Join-Path $repoRoot "test/powershell"


+            $matches = Select-String -Path $file.FullName -Pattern $parameterPattern -CaseSensitive -AllMatches
+            foreach ($m in $matches) {


+        # High-frequency switches that should appear PascalCase in source.
+        # Intentional lowercase uses (binding case-insensitivity tests, stream fixtures)
+        # are allowlisted by relative path below.
+        $parameterPattern = '(?<=[\s|])-(force|erroraction|warningaction|verbose|debug|whatif|confirm)(?=[\s:\|]|$)'


+        $allowlistRelativePaths = @(
+            "test/powershell/Language/Scripting/CommonParameters.Tests.ps1"
+            "test/powershell/Language/Parser/BNotOperator.Tests.ps1"
+            "test/powershell/Language/Parser/RedirectionOperator.Tests.ps1"
+            "test/powershell/engine/Basic/ParameterCapitalization.Tests.ps1"
+        )


+        )
+    }
+
+    It "Uses PascalCase for common parameters (no bare lowercase -force / -erroraction / etc.)" {


Add parameter capitalization guardrail for PowerShell tests

1ae8214

Fixes a handful of lowercase common parameters (-force, etc.) and adds a CI test so we don't reintroduce them. Intentional case-insensitivity fixtures stay allowlisted. Addresses PowerShell#26614.

Copilot AI review requested due to automatic review settings July 11, 2026 21:06

Pitchfork-and-Torch requested a review from a team as a code owner July 11, 2026 21:06

Copilot started reviewing on behalf of Pitchfork-and-Torch July 11, 2026 21:06 View session

Copilot AI reviewed Jul 11, 2026

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Add parameter capitalization guardrail for PowerShell tests#27677

Add parameter capitalization guardrail for PowerShell tests#27677
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		$repoRoot = (Resolve-Path (Join-Path $PSScriptRoot "../../..")).Path
		$scanRoot = Join-Path $repoRoot "test/powershell"

		$matches = Select-String -Path $file.FullName -Pattern $parameterPattern -CaseSensitive -AllMatches
		foreach ($m in $matches) {

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Pitchfork-and-Torch commented Jul 11, 2026

Summary

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Testing

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