Enforce Language parameter with InstallLanguagePack

Added validation to require the -Language parameter when -InstallLanguagePack is specified in Install-Defaults.ps1. Updated Install-deDE.ps1 to use -InstallLanguagePack and added a test to verify the new validation logic.

Author: aaronparker

src/Install-Defaults.ps1

@@ -45,6 +45,12 @@ param (
     [System.Globalization.CultureInfo] $Language, # Set the specified locale / language
 
     [Parameter(Mandatory = $false)]
+    [ValidateScript({
+        if ($_ -and -not $PSBoundParameters.ContainsKey('Language')) {
+            throw "The -Language parameter is required when -InstallLanguagePack is specified."
+        }
+        return $true
+    })]
     [System.Management.Automation.SwitchParameter] $InstallLanguagePack, # Install the language pack for the specified language
 
     [Parameter(Mandatory = $false)]

src/Install-deDE.ps1

@@ -36,4 +36,4 @@ if (!([System.Environment]::Is64BitProcess)) {
 #endregion
 
 Set-Location -Path $PSScriptRoot
-& "$PSScriptRoot\Install-Defaults.ps1" -Language "de-DE" -TimeZone "Georgian Standard Time"
+& "$PSScriptRoot\Install-Defaults.ps1" -Language "de-DE" -InstallLanguagePack -TimeZone "Georgian Standard Time"

tests/Install-Defaults.Tests.ps1

@@ -113,6 +113,17 @@ Describe 'Install-Defaults.ps1 Script Execution' -Skip:(-not $IsAdmin) {
 }
 
 Describe 'Install-Defaults.ps1 Language Support' -Skip:(-not $IsAdmin) {
+    It 'Should require Language parameter when InstallLanguagePack is specified' {
+        Push-Location -Path $([System.IO.Path]::Combine($Path, "src"))
+        $params = @{
+            Path                = $([System.IO.Path]::Combine($Path, "src"))
+            InstallLanguagePack = $true
+            WhatIf              = $true
+        }
+        { & $ScriptPath.FullName @params } | Should -Throw -ExpectedMessage "The -Language parameter is required when -InstallLanguagePack is specified."
+        Pop-Location
+    }
+
     It 'Should install language pack only on supported OS' {
         if ($OSInfo.SupportsLanguagePack) {
             Push-Location -Path $([System.IO.Path]::Combine($Path, "src"))