tests/Test-AdSchemaExtension.ps1

function Test-AdSchemaExtension {
    [CmdletBinding()]
    param (
        [parameter()][string] $TestName = "Active Directory Schema Extended",
        [parameter()][string] $TestGroup = "configuration",
        [parameter()][string] $Description = "Verify AD schema extensions have been installed",
        [parameter()][hashtable] $ScriptParams
    )
    $startTime = (Get-Date)
    $stat = "PASS"
    $except = "FAIL"
    try {
        [System.Collections.Generic.List[PSObject]]$tempdata = @() # for detailed test output to return if needed
        Write-Verbose "Verifying for AD Schema extension"
        $strFilter = "(&(objectClass=mSSMSSite)(Name=*))"
        $objDomain = New-Object System.DirectoryServices.DirectoryEntry
        $objSearcher = New-Object System.DirectoryServices.DirectorySearcher
        $objSearcher.SearchRoot = $objDomain
        $objSearcher.PageSize = 1000
        $objSearcher.Filter = $strFilter
        $objSearcher.SearchScope = "Subtree"
        $colProplist = "name"
        foreach ($i in $colProplist){$objSearcher.PropertiesToLoad.Add($i) | Out-Null}
        $colResults = $objSearcher.FindAll()
        if ($colResults.Count -gt 0) {
            Write-Verbose "schema has been extended"
            $obj = Get-ADSIObject -Identity $colResults.Path.Substring(7)
            $msg  = "Active Directory schema has been extended for configmgr"
            $tempdata.Add(
                [pscustomobject]@{
                    ObjectName  = $obj.name
                    Container   = $obj.adspath
                    DateCreated = $obj.whencreated
                    DateChanged = $obj.whenchanged
                }
            )
        } else {
            $stat = $except
            $msg  = "Active Directory schema has NOT been extended for configmgr"
        }
    }
    catch {
        $stat = 'ERROR'
        $msg  = $_.Exception.Message -join ';'
    }
    finally {
        $rt = Get-RunTime -BaseTime $startTime
        Write-Output $([pscustomobject]@{
            TestName    = $TestName
            TestGroup   = $TestGroup
            TestData    = $tempdata
            Description = $Description
            Status      = $stat
            Message     = $msg
            RunTime     = $rt
            Credential  = $(if($ScriptParams.Credential){$($ScriptParams.Credential).UserName} else { $env:USERNAME })
        })
    }
}