Create Get-ZAVpg Function and Tests

Tests/Public/Get-ZAVpg.Tests.ps1

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+#Requires -Modules Pester
+$moduleFileName = "ZertoApiWrapper.psd1"
+$here = (Split-Path -Parent $MyInvocation.MyCommand.Path).Replace("Tests", "ZertoApiWrapper")
+$sut = (Split-Path -Leaf $MyInvocation.MyCommand.Path).Replace(".Tests.", ".")
+$file = Get-ChildItem "$here\$sut"
+$modulePath = $here -replace "Public", ""
+$moduleFile = Get-ChildItem "$modulePath\$moduleFileName"
+Get-Module -Name ZertoApiWrapper | Remove-Module -Force
+Import-Module $moduleFile -Force
+
+Describe $file.BaseName -Tag 'Unit' {
+
+    It "is valid Powershell (Has no script errors)" {
+        $contents = Get-Content -Path $file -ErrorAction Stop
+        $errors = $null
+        $null = [System.Management.Automation.PSParser]::Tokenize($contents, [ref]$errors)
+        $errors | Should -HaveCount 0
+    }
+}

ZertoApiWrapper/Public/Get-ZAVpg.ps1

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+<# .ExternalHelp ./en-us/ZertoApiWrapper-help.xml #>
+function Get-ZAVpg {
+    [cmdletbinding(DefaultParameterSetName = 'zOrg')]
+    param(
+        [Parameter(
+            HelpMessage = "The ZORG identifier by which to filter the VPG list. If the ZORG identifier is omitted, a list of all VPGs is retrieved.",
+            ParameterSetName = 'zOrg'
+        )]
+        [ValidateNotNullOrEmpty()]
+        [string]$zOrgIdentifier,
+        [Parameter(
+            HelpMessage = "The VPG Identifier",
+            ParameterSetName = "vpg",
+            Mandatory = $true
+        )]
+        [ValidateNotNullOrEmpty()]
+        [string]$vpgIdentifier
+    )
+    $uri = "monitoring/vpgs"
+
+    switch ($PSCmdlet.ParameterSetName) {
+        zOrg {
+            if ( -not [String]::IsNullorEmpty($zOrgIdentifier) ) {
+                $filterTable = @{"zOrgIdentifier" = $zOrgIdentifier }
+                $filterString = Get-ZertoApiFilter -filterTable $filterTable
+                $uri = "{0}{1}" -f $uri, $filterString
+            }
+        }
+
+        vpg {
+            $uri = "{0}/$vpgIdentifier"
+        }
+    }
+
+    Invoke-ZARestRequest -uri $uri
+}