Move v4 CI from AppVeyor to GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,55 @@
+# CI for the Pester v4 maintenance branch. Replaces the dead AppVeyor setup.
+#
+# v4 is in security-fix-only maintenance. We test only Windows PowerShell 5.1
+# and PowerShell 7 — nothing else is guaranteed. The goal is to keep the branch
+# releasable: green CI here means a security fix can be validated and shipped
+# through the manual release process (release.ps1).
+name: CI
+
+on:
+  push:
+    branches: ['rel/4.x.x']
+  pull_request:
+    branches: ['rel/4.x.x']
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 30
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { name: 'PS5.1 - Windows', id: ps51-windows, os: windows-latest, psexe: powershell }
+          - { name: 'PS7 - Windows',   id: ps7-windows,  os: windows-latest, psexe: pwsh }
+          - { name: 'PS7 - Ubuntu',    id: ps7-ubuntu,   os: ubuntu-latest,  psexe: pwsh }
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 1
+
+      # Same test invocation AppVeyor used: import the module from the repo
+      # root and run the suite, excluding the tags that need extra tooling.
+      # `shell:` cannot take a matrix expression, so run from a fixed pwsh and
+      # launch the leg's interpreter: pwsh for PS7, powershell (Windows
+      # PowerShell 5.1) for the 5.1 leg. exit $LASTEXITCODE so a failure in
+      # the launched process still fails the job.
+      - name: Test Pester
+        shell: pwsh
+        run: |
+          & ${{ matrix.psexe }} -NoProfile -Command '$PSVersionTable; Set-StrictMode -Version Latest; $global:PesterDebugPreference_ShowFullErrors = $true; Import-Module ./Pester.psd1; Invoke-Pester -ExcludeTag VersionChecks, StyleRules, Help -EnableExit -OutputFile TestResults.xml -OutputFormat NUnitXml'
+          exit $LASTEXITCODE
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: results-${{ matrix.id }}
+          retention-days: 7
+          if-no-files-found: ignore
+          path: TestResults.xml

Functions/TestDrive.Tests.ps1

@@ -1,7 +1,11 @@
 Set-StrictMode -Version Latest
 
 if ($PSVersionTable.PSVersion.Major -lt 6 -or $IsWindows) {
-    $tempPath = $env:TEMP
+    # don't use $env:TEMP directly, GitHub Actions runners set it to the 8.3
+    # short form (C:\Users\RUNNER~1\...) but TestDrive is created via
+    # GetTempPath which returns the long form, so the -like comparisons below
+    # would never match
+    $tempPath = [System.IO.Path]::GetTempPath()
 }
 elseif ($IsMacOS) {
     $tempPath = '/private/tmp'

Functions/TestResults.Tests.ps1

@@ -198,7 +198,7 @@ InModuleScope Pester {
                 #create state
                 $TestResults = New-PesterState -Path TestDrive:\
                 $testResults.EnterTestGroup('Describe #1', 'Describe')
-                $TestResults.AddTestResult("Successful testcase", 'Passed', (New-TimeSpan -mi 1))
+                $TestResults.AddTestResult("Successful testcase", 'Passed', (New-TimeSpan -Minutes 1))
                 $testResults.LeaveTestGroup('Describe #1', 'Describe')
                 $testResults.EnterTestGroup('Describe #2', 'Describe')
                 $TestResults.AddTestResult("Failed testcase", 'Failed', (New-TimeSpan -Seconds 2))
@@ -352,7 +352,7 @@ InModuleScope Pester {
                 #create state
                 $TestResults = New-PesterState -Path TestDrive:\
                 $testResults.EnterTestGroup('Describe #1', 'Describe')
-                $TestResults.AddTestResult("Successful testcase", 'Passed', (New-TimeSpan -mi 1))
+                $TestResults.AddTestResult("Successful testcase", 'Passed', (New-TimeSpan -Minutes 1))
                 $testResults.LeaveTestGroup('Describe #1', 'Describe')
                 $testResults.EnterTestGroup('Describe #2', 'Describe')
                 $TestResults.AddTestResult("Failed testcase", 'Failed', (New-TimeSpan -Seconds 2))