Re-add ReportServerEdition enum to SqlRSSetup class

Co-authored-by: johlju <7189721+johlju@users.noreply.github.com>

Author: Copilot

source/Classes/020.SqlRSSetup.ps1

@@ -187,8 +187,7 @@ class SqlRSSetup : ResourceBase
     $EditionUpgrade
 
     [DscProperty()]
-    [ValidateSet('Developer', 'Evaluation', 'ExpressAdvanced')]
-    [System.String]
+    [ReportServerEdition]
     $Edition
 
     [DscProperty()]

source/Enum/001.ReportServerEdition.ps1

@@ -0,0 +1,12 @@
+<#
+    .SYNOPSIS
+        The possible states for the commands and DSC resources that handles
+        SQL Server Reporting Services or Power BI Report Server and uses the
+        parameter Edition.
+#>
+enum ReportServerEdition
+{
+    Developer = 1
+    Evaluation
+    ExpressAdvanced
+}

tests/Unit/Classes/SqlRSSetup.Tests.ps1

@@ -129,7 +129,8 @@ Describe 'SqlRSSetup\Get()' -Tag 'Get' {
                     $currentState.MediaPath | Should -BeNullOrEmpty
                     $currentState.ProductKey | Should -BeNullOrEmpty
                     $currentState.EditionUpgrade | Should -BeNullOrEmpty
-                    $currentState.Edition | Should -BeNullOrEmpty
+                    # Returns 0, that means no value was set by GetCurrentState() from the enum ReportServerEdition
+                    $currentState.Edition | Should -Be 0
                     $currentState.LogPath | Should -BeNullOrEmpty
                     $currentState.InstallFolder | Should -BeNullOrEmpty
                     $currentState.SuppressRestart | Should -BeFalse
@@ -187,7 +188,8 @@ Describe 'SqlRSSetup\Get()' -Tag 'Get' {
                     $currentState.MediaPath | Should -BeNullOrEmpty
                     $currentState.ProductKey | Should -BeNullOrEmpty
                     $currentState.EditionUpgrade | Should -BeNullOrEmpty
-                    $currentState.Edition | Should -BeNullOrEmpty
+                    # Returns 0, that means no value was set by GetCurrentState() from the enum ReportServerEdition
+                    $currentState.Edition | Should -Be 0
                     $currentState.LogPath | Should -BeNullOrEmpty
                     $currentState.InstallFolder | Should -BeNullOrEmpty
                     $currentState.SuppressRestart | Should -BeFalse