Replace mocked GitHubCustomProperty unit tests with API integration test

Removed fabricated [PSCustomObject] tests from GitHub.Tests.ps1 and added
a real integration test in Repositories.Tests.ps1 that calls
Get-GitHubRepositoryCustomProperty against org repositories and validates
that multi-select values are preserved as [string[]] arrays.

Author: MariusStorhaug

tests/GitHub.Tests.ps1

@@ -19,43 +19,6 @@
 [CmdletBinding()]
 param()
 
-Describe 'GitHubCustomProperty' {
-    It 'Preserves array value for multi-select properties' {
-        $obj = [PSCustomObject]@{
-            property_name = 'SubscribeTo'
-            value         = @('Custom Instructions', 'License', 'Prompts')
-        }
-        $prop = [GitHubCustomProperty]::new($obj)
-        $prop.Name | Should -Be 'SubscribeTo'
-        $prop.Value -is [string[]] | Should -BeTrue -Because 'multi-select values must be preserved as string arrays'
-        $prop.Value | Should -HaveCount 3
-        $prop.Value[0] | Should -Be 'Custom Instructions'
-        $prop.Value[1] | Should -Be 'License'
-        $prop.Value[2] | Should -Be 'Prompts'
-    }
-
-    It 'Keeps scalar string value as string' {
-        $obj = [PSCustomObject]@{
-            property_name = 'Type'
-            value         = 'Module'
-        }
-        $prop = [GitHubCustomProperty]::new($obj)
-        $prop.Name | Should -Be 'Type'
-        $prop.Value | Should -Be 'Module'
-        $prop.Value | Should -BeOfType [string]
-    }
-
-    It 'Handles GraphQL-style property names' {
-        $obj = [PSCustomObject]@{
-            propertyName = 'Environment'
-            value        = 'production'
-        }
-        $prop = [GitHubCustomProperty]::new($obj)
-        $prop.Name | Should -Be 'Environment'
-        $prop.Value | Should -Be 'production'
-    }
-}
-
 Describe 'Auth' {
     $authCases = . "$PSScriptRoot/Data/AuthCases.ps1"
 
@@ -330,7 +293,7 @@ Describe 'GitHub' {
             $stamps.Count | Should -BeGreaterThan 0
         }
         It 'Get-GitHubStamp - Each stamp has Name and BaseUrl properties' {
-            LogGroup "Stamps - Details" {
+            LogGroup 'Stamps - Details' {
                 Get-GitHubStamp | ForEach-Object {
                     Write-Host ($_ | Format-List | Out-String)
                     $_.Name | Should -Not -BeNullOrEmpty

tests/Repositories.Tests.ps1

@@ -518,6 +518,22 @@ Describe 'Repositories' {
             }
             $repos.Count | Should -BeGreaterThan 0
         }
+        It 'Get-GitHubRepositoryCustomProperty - Gets custom properties and preserves value types' -Skip:($OwnerType -ne 'organization') {
+            LogGroup 'Custom Properties' {
+                $properties = Get-GitHubRepositoryCustomProperty -Owner $owner -Repository $repoName
+                Write-Host ($properties | Format-List | Out-String)
+            }
+            if ($properties) {
+                foreach ($prop in $properties) {
+                    $prop.Name | Should -Not -BeNullOrEmpty
+                    if ($prop.Value -is [System.Collections.IEnumerable] -and $prop.Value -isnot [string]) {
+                        $prop.Value -is [string[]] | Should -BeTrue -Because "multi-select values must be preserved as string arrays, got: $($prop.Value.GetType().FullName)"
+                    } else {
+                        $prop.Value | Should -BeOfType [string]
+                    }
+                }
+            }
+        }
         It 'Set-GitHubRepository - Updates an existing repository' -Skip:($OwnerType -in ('repository', 'enterprise')) {
             $description = 'Updated description'
             LogGroup 'Repository - Set update' {