Re-adding prevention of SAC release. Also adding tests to determine at prereq check if SAC release and fail test.

Lastly, swapped out "exit" for "throw" to create a terminating error but not exit the shell.

Convert-LBFO2SET.psm1

@@ -79,13 +79,12 @@ Function Convert-LBFO2Set {
             }
             else 
             {
-                Write-Error "An LBFO team associated with $LBFOTeam could not be detected."    
+                Throw "An LBFO team associated with $LBFOTeam could not be detected."    
             }
         }
         else 
         {
-            Write-Error "Failed to find an LBFO team or vSwitch named $LBFOTeam`."
-            exit
+            Throw "Failed to find an LBFO team or vSwitch named $LBFOTeam`."
         }
 
         Remove-Variable isLBFOTeam,isvSwitch,tmpAdapter,tmpTeam -ErrorAction SilentlyContinue
@@ -100,8 +99,7 @@ Function Convert-LBFO2Set {
 
     if (-NOT $here)
     {
-        Write-Error "Could not find the module path."
-        exit
+        throw "Could not find the module path."
     }
 
     # detect the version of Windows
@@ -114,26 +112,24 @@ Function Convert-LBFO2Set {
         {
             switch ($osBldVer)
             {
-                { $_ -ge 14393 -and $_ -lt 17763} {
+                14393 {
                     $nicReconnBin = "nicReconnect1.exe"
                 }
                 
-                { $_ -ge 17763 } {
+                17763 {
                     $nicReconnBin = "nicReconnect5.exe"
                 }
 
                 default
                 {
-                    Write-Error "This version of Windows is not yet certified for Convert-LBFO2SET."
-                    exit
+                    throw "This version of Windows is not yet certified for Convert-LBFO2SET."
                 }
             }
         }
 
         default
         {
-            Write-Error "A supported version of Windows was not detected."
-            exit
+            throw "A supported version of Windows was not detected."
         }
     }
 
@@ -254,8 +250,7 @@ Function Convert-LBFO2Set {
         }
         catch 
         {
-            Write-Error "Failed to migrate host vNIC(s)."   
-            exit
+            throw "Failed to migrate host vNIC $($HostvNIC.Name)."   
         }        
     }
 
@@ -263,8 +258,7 @@ Function Convert-LBFO2Set {
     $vmMigGood = Get-VMNetworkAdapter -All | Where-Object SwitchName -EQ $configData.LBFOVMSwitch.Name -ErrorAction SilentlyContinue
     if ($vmMigGood)
     {
-        Write-Error "Critical vmNIC migration failure. The following virtual NICs were not migrated to the new SET switch:`n$($vmMigGood | ForEach-Object { "`n`t$($_.Name) [$(if ($_.VMName) {"$($_.VMName)"} else {"host"})] " })"
-        exit
+        throw "Critical vmNIC migration failure. The following virtual NICs were not migrated to the new SET switch:`n$($vmMigGood | ForEach-Object { "`n`t$($_.Name) [$(if ($_.VMName) {"$($_.VMName)"} else {"host"})] " })"
     }
 
 #region Fire and Brimstone

tests/unit/unit.tests.ps1

@@ -1,12 +1,21 @@
 Describe 'OSValidation' -Tag PreValidation {
     Context HostOS {
         $NodeOS = Get-CimInstance -ClassName 'Win32_OperatingSystem'
+        
+        # detect the version of Windows
+        $osBldVer = [System.Environment]::OSVersion.Version.Build
 
         ### Verify the Host is sufficient version
         It "${env:ComputerName}`: Must be Windows Server 2016, or Server 2019" {
             $NodeOS.Caption | Should be ($NodeOS.Caption -like '*Windows Server 2016*' -or $NodeOS.Caption -like '*Windows Server 2019*')
         }
 
+        It "${env:ComputerName}`: Must NOT be a SAC release" {
+            # 14393 defines Server 2016 RS1
+            # 17763 defines Server 2019 RS5
+            $osBldVer | Should -BeIn @(14393, 17763)
+        }
+
         $HyperVInstallation = (Get-WindowsFeature -Name Hyper-V -ComputerName $env:ComputerName -ErrorAction SilentlyContinue).InstallState
 
         It "${env:ComputerName}`: Must have Hyper-V installed" {