Add tests for preview

Author: agriyakhetarpal

.github/workflows/Action-Test.yml

@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        version: ['latest', '7.4.7', '7.5.0']
+        version: ['latest', 'preview', '7.4.7', '7.5.0']
     runs-on: ${{ matrix.os }}
     name: '${{ matrix.os }} - [${{ matrix.version }}]'
     steps:
@@ -34,7 +34,8 @@ jobs:
       - name: Action-Test
         uses: ./
         with:
-          Version: ${{ matrix.version }}
+          Version: ${{ matrix.version == 'preview' && 'latest' || matrix.version }}
+          Preview: ${{ matrix.version == 'preview' && 'true' || 'false' }}
 
       - name: Verify installed version
         shell: pwsh
@@ -44,8 +45,19 @@ jobs:
           # Requested version that came from the matrix
           $requested = '${{ matrix.version }}'
 
+          # When 'preview' → resolve to latest preview release
+          if ($requested.Trim().ToLower() -eq 'preview') {
+              $releases = Invoke-RestMethod -Uri 'https://api.github.com/repos/PowerShell/PowerShell/releases' `
+                -Headers @{
+                  'Accept' = 'application/vnd.github+json'
+                  'Authorization' = "Bearer $($env:GITHUB_TOKEN)"
+                  'X-GitHub-Api-Version' = '2022-11-28'
+                }
+              $requested = ($releases | Where-Object { $_.prerelease -eq $true } | Select-Object -First 1).tag_name.TrimStart('v')
+              Write-Host "Resolved 'preview' → $requested"
+          }
           # When empty / 'null' / 'latest' → resolve to latest stable release
-          if ([string]::IsNullOrWhiteSpace($requested) -or
+          elseif ([string]::IsNullOrWhiteSpace($requested) -or
               $requested.Trim().ToLower() -in @('latest','null')) {
 
               $requested = (