tests/Test-HostOperatingSystem.ps1

function Test-HostOperatingSystem {
    [CmdletBinding()]
    param (
        [parameter()][string] $TestName = "Validate Host Operating System",
        [parameter()][string] $TestGroup = "configuration",
        [parameter()][string] $Description = "Validate supported operating system for CM site system roles",
        [parameter()][hashtable] $ScriptParams
    )
    try {
        [System.Collections.Generic.List[PSObject]]$tempdata = @() # for detailed test output to return if needed
        $stat = "PASS"
        $msg  = "No issues found"
        $supported = @('Microsoft Windows Server 2016','Microsoft Windows Server 2019','Microsoft Windows 10 Enterprise')
        $osdata = Get-CimInstance -ClassName Win32_OperatingSystem -ComputerName $ScriptParams.ComputerName 
        $osname = $osdata.Caption
        $osbuild = $osdata.BuildNumber
        if ($osname -notin $supported) {
            $stat = "FAIL"
            $msg = "Unsupported operating system for site system roles: $osname $osbuild"
        }
    }
    catch {
        $stat = 'ERROR'
        $msg = $_.Exception.Message -join ';'
    }
    finally {
        Write-Output $([pscustomobject]@{
            TestName    = $TestName
            TestGroup   = $TestGroup
            TestData    = $tempdata
            Description = $Description
            Status      = $stat 
            Message     = $msg
        })
    }
}