Add GitHub Actions annotations for Pester test failures (#26789)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: TravisEz13 <10873629+TravisEz13@users.noreply.github.com>
Co-authored-by: Travis Plunk <travis.plunk@microsoft.com>

.github/actions/test/process-pester-results/process-pester-results.ps1

@@ -24,6 +24,7 @@ $testIgnoredCount = 0
 $testSkippedCount = 0
 $testInvalidCount = 0
 
+# Process test results and generate annotations for failures
 Get-ChildItem -Path "${TestResultsFolder}/*.xml" -Recurse | ForEach-Object {
     $results = [xml] (get-content $_.FullName)
 
@@ -35,6 +36,61 @@ Get-ChildItem -Path "${TestResultsFolder}/*.xml" -Recurse | ForEach-Object {
     $testIgnoredCount += [int]$results.'test-results'.ignored
     $testSkippedCount += [int]$results.'test-results'.skipped
     $testInvalidCount += [int]$results.'test-results'.invalid
+
+    # Generate GitHub Actions annotations for test failures
+    # Select failed test cases
+    if ("System.Xml.XmlDocumentXPathExtensions" -as [Type]) {
+        $failures = [System.Xml.XmlDocumentXPathExtensions]::SelectNodes($results.'test-results', './/test-case[@result = "Failure"]')
+    }
+    else {
+        $failures = $results.SelectNodes('.//test-case[@result = "Failure"]')
+    }
+
+    foreach ($testfail in $failures) {
+        $description = $testfail.description
+        $testName = $testfail.name
+        $message = $testfail.failure.message
+        $stack_trace = $testfail.failure.'stack-trace'
+
+        # Parse stack trace to get file and line info
+        $fileInfo = Get-PesterFailureFileInfo -StackTraceString $stack_trace
+
+        if ($fileInfo.File) {
+            # Convert absolute path to relative path for GitHub Actions
+            $filePath = $fileInfo.File
+
+            # GitHub Actions expects paths relative to the workspace root
+            if ($env:GITHUB_WORKSPACE) {
+                $workspacePath = $env:GITHUB_WORKSPACE
+                if ($filePath.StartsWith($workspacePath)) {
+                    $filePath = $filePath.Substring($workspacePath.Length).TrimStart('/', '\')
+                    # Normalize to forward slashes for consistency
+                    $filePath = $filePath -replace '\\', '/'
+                }
+            }
+
+            # Create annotation title
+            $annotationTitle = "Test Failure: $description / $testName"
+
+            # Build the annotation message
+            $annotationMessage = $message -replace "`n", "%0A" -replace "`r"
+
+            # Build and output the workflow command
+            $workflowCommand = "::error file=$filePath"
+            if ($fileInfo.Line) {
+                $workflowCommand += ",line=$($fileInfo.Line)"
+            }
+            $workflowCommand += ",title=$annotationTitle::$annotationMessage"
+
+            Write-Host $workflowCommand
+
+            # Output a link to the test run
+            if ($env:GITHUB_SERVER_URL -and $env:GITHUB_REPOSITORY -and $env:GITHUB_RUN_ID) {
+                $logUrl = "$($env:GITHUB_SERVER_URL)/$($env:GITHUB_REPOSITORY)/actions/runs/$($env:GITHUB_RUN_ID)"
+                Write-Host "Test logs: $logUrl"
+            }
+        }
+    }
 }
 
 @"