tests/Test-CmCollectionRefresh.ps1

function Test-CmCollectionRefresh {
    [CmdletBinding()]
    param (
        [parameter()][string] $TestName = "CM Collection Refresh",
        [parameter()][string] $TestGroup = "configuration",
        [parameter()][string] $Description = "Validate Collections refresh impact on performance",
        [parameter()][hashtable] $ScriptParams
    )
    try {
        [System.Collections.Generic.List[PSObject]]$tempdata = @() # for detailed test output to return if needed
        $stat = "PASS"
        $msg = "No issues found"
        $query = "Select (Case when RefreshType = 1 then 'Manual'
when RefreshType = 2 then 'Scheduled'
when RefreshType = 4 then 'Incremental'
when RefreshType = 6 then 'Scheduled and Incremental'
else 'Unknown' end) as RefreshType, count(SiteID) as Collections
from v_Collections
group by RefreshType"

        $cdat = Invoke-DbaQuery -SqlInstance $ScriptParams.SqlInstance -Database $ScriptParams.Database -Query $query
        $c1 = $cdat | Where-Object {$_.RefreshType -eq 'Incremental'} | Select-Object -ExpandProperty Collections
        $c2 = $cdat | Where-Object {$_.RefreshType -eq 'Scheduled'} | Select-Object -ExpandProperty Collections
        $c3 = $c1 + $c2
        if ($c3 -gt 200) {
            $stat = "FAIL"
            $msg  = "More than 200 collections are incremental or scheduled"
        }
    }
    catch {
        $stat = 'ERROR'
        $msg = $_.Exception.Message -join ';'
    }
    finally {
        Write-Output $([pscustomobject]@{
            TestName    = $TestName
            TestGroup   = $TestGroup
            TestData    = $tempdata
            Description = $Description
            Status      = $stat 
            Message     = $msg
        })
    }
}