tests/Test-HostDiskSpace.ps1

function Test-HostDiskSpace {
    [CmdletBinding()]
    param (
        [parameter()][string] $TestName = "Test-HostDiskSpace",
        [parameter()][string] $TestGroup = "configuration",
        [parameter()][string] $Description = "Validate logical disk utilitization",
        [parameter()][hashtable] $ScriptParams
    )
    try {
        $startTime = (Get-Date)
        [int]$MaxPctUsed = Get-CmHealthDefaultValue -KeySet "siteservers:DiskSpaceMaxPercent" -DataSet $CmHealthConfig
        Write-Verbose "MaxPctUsed = $MaxPctUsed"

        [System.Collections.Generic.List[PSObject]]$tempdata = @()
        $stat   = "PASS"
        $except = "FAIL"
        $msg    = "No issues found"
        $disks  = Get-WmiQueryResult -ClassName "Win32_LogicalDisk" -Query "DriveType = 3" -Params $ScriptParams
        foreach ($disk in $disks) {
            $drv  = $disk.DeviceID
            $size = $disk.Size
            $free = $disk.FreeSpace
            $used = $size - $free
            $pct  = $([math]::Round($used / $size, 1)) * 100
            if ($pct -gt $MaxPctUsed) {
                $stat = $except
                $msg  = "One or more disks are low on free space"
            }
            $tempdata.Add(
                [pscustomobject]@{
                    Drive   = $drv
                    Size    = $size
                    Used    = $used
                    PctUsed = $pct
                    MaxPct  = $MaxPctUsed
                }
            )
        } # foreach
    }
    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 })
        })
    }
}