Pester tests for validating the configuration of a server matches the configuration captured previously (e.g prior to a change).

Audit-Computer.ps1

Get-WmiObject Win32_logicaldisk | Export-Clixml "$env:computername-LogicalDisks.xml"
(Get-Service | select name,displayname,status) | Export-Clixml "$env:computername-Services.xml"
(Get-WmiObject Win32_NetworkAdapterConfiguration | Where-Object {$_.IPEnabled -eq "True"}) | Export-Clixml "$env:computername-Network.xml"

Audit.tests.ps1

Describe "Validating Disk configuration of $env:computername" {
    
    Import-Clixml "$env:computername-LogicalDisks.xml" | ForEach-Object {
        
        $PrevDisk = $_
        $CurrDisk = Get-WmiObject Win32_logicaldisk | Where-Object {$_.DeviceID -eq $PrevDisk.DeviceID}

        Context "Disk $($PrevDisk.DeviceID) checks" {
        
            It "Disk $($PrevDisk.DeviceID) previously existed" { 
                $CurrDisk | Should Be $True
            }

            ($PrevDisk | Select DeviceID,DriveType,ProviderName,Size,VolumeName).psobject.properties | ForEach-Object {
        
                It "Disk $($PrevDisk.DeviceID) $($_.name) was previously $($_.value)" { 
                    $CurrDisk."$($_.name)" | Should Be $_.value
                }
            }
        }
    }
}

Describe "Validating Service configuration of $env:computername" {

    $Statuses = @('Running','Stopped')

    $Statuses | ForEach-Object {
        $Status = $_
        Context "Checking $Status services" {
            
            Import-Clixml "$env:computername-Services.xml" | Where-Object {$_.status.value -eq $Status} | ForEach-Object {
        
                $PrevService = $_
                $CurrService = Get-Service | Where-Object {$_.name -eq $PrevService.name}

                It "Service '$($PrevService.displayname)' ($($CurrService.name)) was previously $($PrevService.status.value)" { 
                    $CurrService.status | Should Be $($PrevService.status.value)
                }
            }
        }
    }
}

Describe "Validating Network configuration of $env:computername" {

    Import-Clixml "$env:computername-Network.xml" | ForEach-Object {
        
        $PrevNetwork = $_
        $CurrNetwork = (Get-WmiObject Win32_NetworkAdapterConfiguration | Where-Object {$_.Index -eq $PrevNetwork.Index})

        Context "Interface '$($PrevNetwork.Description)' checks" {
        
            It "Interface $($PrevNetwork.Description) previously existed" { 
                $CurrNetwork | Should Be $True
            }

            ($PrevNetwork | Select DHCPEnabled,DHCPServer,DNSDomain,DNSDomainSuffixSearchOrder,DomainDNSRegistrationEnabled,FullDNSRegistrationEnabled,IPAddress,DefaultIPGateway,IPSubnet).psobject.properties | ForEach-Object {
        
                It "$($_.name) was previously $($_.value)" { 
                    $CurrNetwork."$($_.name)" | Should Be $_.value
                }
            }
        }
    }
}