Tests VLANs in VMWare using PowerShell, Pester, and PowerCLI by swapping a VM into different networks, setting an IP, and verifying connectivity.

vlantester.tests.ps1

Connect-VIServer -Server YOUR_VCENTER_SERVER | Out-Null

#build a credential object to connect to the VM at the OS level to switch the network settings
$secpwd = ConvertTo-SecureString "PASSWORD_GOES_HERE" -AsPlainText -Force  
$cred = New-Object System.Management.Automation.PSCredential ("ACCOUNT_GOES_HERE",  $secpwd)

#set a hash tables of VMWare networks and an IP address in each network
$networks = @{
   "VLAN1" = "192.168.1.5"
   "VLAN2" = "192.168.2.5"
}

#grab the network adapter for our test VM
$networkAdapter = Get-NetworkAdapter -VM VLANTESTER

Describe "Check VLANs" {
   foreach ($h in $networks.Keys | Sort) {
      It "VLAN $($h)" {
         #set the machine's VLAN
         Set-NetworkAdapter -NetworkAdapter $networkAdapter -NetworkName $h -WakeOnLan:$true -StartConnected:$true -Connected:$true -Confirm:$false | Out-Null

         #nuke the old IP
         Invoke-VMScript -VM VLANTESTER -ScriptText "Get-NetIPAddress | Where-Object {`$_.InterfaceIndex -eq '12' -AND `$_.AddressFamily -eq 'IPv4'} | Remove-NetIPAddress -Confirm:`$false" -GuestCredential $cred | Out-Null
   
         #nuke the old gateway
         Invoke-VMScript -VM VLANTESTER -ScriptText "Get-NetRoute | Where-Object {`$_.NextHop -ne '0.0.0.0' -AND `$_.DestinationPrefix -eq '0.0.0.0/0'} | Remove-NetRoute -Confirm:`$false" -GuestCredential $cred | Out-Null
   
         #calculate the gateway
         $ip = $networks[$h]
         $sep = $ip.lastindexof(".") 
         $gateway = $ip.substring(0,$sep) + ".254"
   
         #configuring the gateway
         Invoke-VMScript -VM VLANTESTER -ScriptText "New-NetIPAddress -InterfaceIndex 12 -IPAddress $ip -PrefixLength 24 -DefaultGateway $gateway" -GuestCredential $cred | Out-Null
         Start-Sleep 3
   
         #testing pings to the new ip
         Test-Connection $ip -Quiet |
         Should be $true
      }
   }
}