Add test for skip windows 10 installation behavior

Author: mokagio

.buildkite/pipeline.yml

@@ -205,3 +205,11 @@ steps:
         notify:
           - github_commit_status:
               context: "install_windows_10_sdk Tests - Version file with version number that is not in the allowed list"
+
+  - label: ":windows: prepare_windows_host_for_app_distribution Tests - Skip Windows 10 SDK Installation"
+    command: .\tests\test-prepare-windows-host-for-app-distribution.ps1
+    agents:
+      queue: windows
+    notify:
+      - github_commit_status:
+          context: "prepare_windows_host_for_app_distribution Tests - Skip Windows 10 SDK Installation"

tests/test-prepare-windows-host-for-app-distribution.ps1

@@ -0,0 +1,53 @@
+# Tests the prepare_windows_host_for_app_distribution.ps1 script with the -SkipWindows10SDKInstallation parameter.
+#
+# We only test the skip behavior because the installation takes a "long" time to run.
+
+param (
+  [int]$ExpectedExitCode = 0,
+)
+
+# Ensure the output is UTF-8 encoded so we can use emojis...
+[System.Console]::OutputEncoding = [System.Text.Encoding]::UTF8
+$emojiGreenCheck = "$([char]0x2705)"
+$emojiRedCross = "$([char]0x274C)"
+
+Write-Output "Testing prepare_windows_host_for_app_distribution.ps1 with -SkipWindows10SDKInstallation"
+
+# Create a valid SDK version file to ensure it's not being used
+$sdkVersion = "20348"
+"$sdkVersion" | Out-File .windows-10-sdk-version
+
+# Run the script with skip parameter
+$output = & "$PSScriptRoot\..\bin\prepare_windows_host_for_app_distribution.ps1" -SkipWindows10SDKInstallation
+$exitCode = $LASTEXITCODE
+
+# Check exit code
+if ($exitCode -ne $ExpectedExitCode) {
+  Write-Output "$emojiRedCross Expected exit code $ExpectedExitCode, got $exitCode"
+  Write-Output "Output was:"
+  Write-Output "$output"
+  exit 1
+} else {
+  Write-Output "$emojiGreenCheck Exit code matches expected value ($ExpectedExitCode)"
+}
+
+$expectedSkipMessage = "Run with SkipWindows10SDKInstallation = true. Skipping Windows 10 SDK installation check."
+if ($output -match [regex]::Escape($expectedSkipMessage)) {
+  Write-Output "$emojiGreenCheck Found expected skip message in output"
+} else {
+  Write-Output "$emojiRedCross Expected to find message about skipping due to parameter, but got:"
+  Write-Output "$output"
+  exit 1
+}
+
+# Verify SDK was not installed by checking the file system
+$windowsSDKsRoot = "C:\Program Files (x86)\Windows Kits\10\bin"
+$sdkPath = "$windowsSDKsRoot\10.0.$sdkVersion\x64"
+If (Test-Path $sdkPath) {
+  Write-Output "$emojiRedCross Found SDK installation at $sdkPath when it should have been skipped"
+  exit 1
+} else {
+  Write-Output "$emojiGreenCheck Confirmed SDK was not installed at $sdkPath"
+}
+
+Write-Output "Test completed successfully."