tests/Test-SqlServiceSPN.ps1

function Test-SqlServicesSPN {
    [CmdletBinding()]
    param (
        [parameter()][string] $TestName = "SQL SPN Registration",
        [parameter()][string] $TestGroup = "configuration",
        [parameter()][string] $Description = "Verify SQL instance Service Principal Name registration",
        [parameter()][hashtable] $ScriptParams
    )
    try {
        [System.Collections.Generic.List[PSObject]]$tempdata = @() # for detailed test output to return if needed
        $stat = "PASS"
        if (-not ($spn = Get-DbaSpn -ComputerName $ScriptParams.SqlInstance -ErrorAction SilentlyContinue)) {
            if ($Remediate -eq $True) {
                
                # more work needed here!

                $stat = 'REMEDIATED'
                $msg  = 'SPN has been successfully registered'
            }
            else {
                $stat = 'FAIL'
                $msg  = 'SPN is not currently registered'
            }
        }
    }
    catch {
        $stat = 'ERROR'
        $msg = $_.Exception.Message -join ';'
    }
    finally {
        Write-Output $([pscustomobject]@{
            TestName    = $TestName
            TestGroup   = $TestGroup
            TestData    = $tempdata
            Description = $Description
            Status      = $stat 
            Message     = $msg
        })
    }
}