Persist per-machine welcome location

tests/WelcomeWallpaper.Tests.ps1

@@ -16,7 +16,9 @@ function Invoke-WelcomeFixture {
         $DirectoryGender,
         [string]$ExplicitGender,
         [string]$DirectoryLocation = 'Sala de pruebas',
-        [string]$DirectoryOu = 'Laboratorio'
+        [string]$DirectoryOu = 'Laboratorio',
+        [string]$MachineLocation,
+        [string]$MachineOu
     )
 
     # Replace only the external directory lookup. Execute the actual script,
@@ -43,11 +45,19 @@ function Invoke-WelcomeFixture {
     }
     if ($ExplicitGender) { $parameters.Gender = $ExplicitGender }
     $previousLocalAppData = $env:LOCALAPPDATA
+    $previousMachineLocation = $env:SGU_WELCOME_LOCATION
+    $previousMachineOu = $env:SGU_WELCOME_ORGANIZATIONAL_UNIT
     try {
         $env:LOCALAPPDATA = $TestDrive
+        $env:SGU_WELCOME_LOCATION = $MachineLocation
+        $env:SGU_WELCOME_ORGANIZATIONAL_UNIT = $MachineOu
         & $testScript @parameters
     }
-    finally { $env:LOCALAPPDATA = $previousLocalAppData }
+    finally {
+        $env:LOCALAPPDATA = $previousLocalAppData
+        $env:SGU_WELCOME_LOCATION = $previousMachineLocation
+        $env:SGU_WELCOME_ORGANIZATIONAL_UNIT = $previousMachineOu
+    }
 }
 
 Describe 'Welcome wallpaper with AD metadata' {
@@ -81,4 +91,13 @@ Describe 'Welcome wallpaper with AD metadata' {
             -DirectoryOu 'Centro de Experiencia Digital'
         $result.LocationText | Should Be 'Acceso al Aula Flexible del Centro de Experiencia Digital.'
     }
+
+    It 'keeps machine location metadata when the GPO command has no location arguments' {
+        $result = Invoke-WelcomeFixture -DirectoryGender $null `
+            -DirectoryLocation 'Sala de pruebas' `
+            -DirectoryOu 'Laboratorio' `
+            -MachineLocation 'Aula Flexible' `
+            -MachineOu 'Centro de Experiencia Digital'
+        $result.LocationText | Should Be 'Acceso al Aula Flexible del Centro de Experiencia Digital.'
+    }
 }