Validate identifiers are present

ZertoApiWrapper/Public/Start-ZertoFailoverTest.ps1

@@ -21,32 +21,34 @@ function Start-ZertoFailoverTest {
     begin {
         $baseUri = "vpgs"
         $vpgIdentifier = $(Get-ZertoVpg -name $vpgName).vpgIdentifier
+        if ( -not $vpgIdentifier) {
+            Write-Error "VPG: $vpgName Not Found. Please check the name and try again!" -ErrorAction Stop
+        }
         if ( $PSBoundParameters.ContainsKey('vmName') ) {
-            $vmIdentifiers = @()
-            $vmIdentifiers = foreach ( $name in $vmName ) {
-                $(Get-ZertoProtectedVm -vmName $name).vmIdentifier
+            $vpgVmInformation = Get-ZertoProtectedVm -vpgName $vpgName
+            [System.Collections.ArrayList]$vmIdentifiers = @()
+            foreach ( $name in $vmName ) {
+                $selectedVm = $vpgVmInformation | Where-Object {$_.VmName.toLower() -eq $name.toLower()}
+                if ($null -eq $selectedVm) {
+                    Write-Error "VM: $name NOT found in VPG $vpgName. Check the name and try again." -ErrorAction Stop
+                } elseif ($vmIdentifiers.Contains($selectedVm.vmIdentifier.toString())) {
+                    Write-Error "VM: $($selectedVm.VmName) specified more than once. Please check parameters and try again." -ErrorAction Stop
+                } else {
+                    $vmIdentifiers.Add($selectedVm.vmIdentifier.toString()) | Out-Null
+                }
+            }
+            $body['VmIdentifiers'] = $vmIdentifiers
+            if ($checkpointIdentifier) {
+                $body['CheckpointIdentifier'] = $checkpointIdentifier
             }
         }
     }
 
     process {
         $uri = "{0}/{1}/FailoverTest" -f $baseUri, $vpgIdentifier
-        $body = [ordered]@{}
-        if ($checkpointIdentifier) {
-            $body['CheckpointIdentifier'] = $checkpointIdentifier
-        }
-        if ( $PSBoundParameters.ContainsKey('vmName') ) {
-            $vmIdentifiers = @()
-            $vmIdentifiers = foreach ( $name in $vmName ) {
-                $(Get-ZertoProtectedVm -vmName $name).vmIdentifier
-            }
-            $body['VmIdentifiers'] = $vmIdentifiers
-        }
-        if ($PSCmdlet.ShouldProcess("Starting Failover Test")) {
+        if ($PSCmdlet.ShouldProcess($vpgName)) {
             Invoke-ZertoRestRequest -uri $uri -method "POST" -body $($body | ConvertTo-Json)
         }
-
-
     }
 
     end {