Create Get-ZAVolume and required files

Tests/Public/Get-ZAVolume.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-ZAVolume.ps1

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+<# .ExternalHelp ./en-us/ZertoApiWrapper-help.xml #>
+function Get-ZAVolume {
+    [CmdletBinding(DefaultParameterSetName = "VpgIdentifier")]
+    param (
+        [Parameter(
+            HelpMessage = "The site identifier. The site identifier is mandatory if vpgIdentifier is not entered.",
+            Mandatory,
+            ParameterSetName = "SiteAndClusterIdentifier"
+        )]
+        [Parameter(
+            HelpMessage = "The site identifier. The site identifier is mandatory if vpgIdentifier is not entered.",
+            Mandatory,
+            ParameterSetName = "SiteAndDatastoreIdentifier"
+        )]
+        [ValidateNotNullOrEmpty()]
+        [string]$siteIdentifier,
+        [Parameter(
+            HelpMessage = "The cluster identifier. If a cluster identifier is not entered, you must enter a datastore identifier.",
+            Mandatory,
+            ParameterSetName = "SiteAndClusterIdentifier"
+        )]
+        [ValidateNotNullOrEmpty()]
+        [string]$clusterIdentifier,
+        [Parameter(
+            HelpMessage = "The datastore identifer. If a datastore identifier is not entered, you must enter a cluster identifier.",
+            Mandatory,
+            ParameterSetName = "SiteAndDatastoreIdentifier"
+        )]
+        [ValidateNotNullOrEmpty()]
+        [string]$datastoreIdentifier,
+        [Parameter(
+            HelpMessage = "The vpg identifer.",
+            Mandatory,
+            ParameterSetName = "VpgIdentifier"
+        )]
+        [string]$vpgIdentifier
+
+    )
+
+    $filter = Get-ZertoApiFilter -FilterTable $PSBoundParameters
+    $uri = "monitoring/volumes{0}" -f $filter
+    Invoke-ZARestRequest -uri $uri
+}

docs/Get-ZAVolume.md

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+---
+external help file: ZertoApiWrapper-help.xml
+Module Name: ZertoApiWrapper
+online version: https://github.com/ZertoPublic/ZertoApiWrapper/blob/master/docs/Get-ZAVolume.md
+schema: 2.0.0
+---
+
+# Get-ZAVolume
+
+## SYNOPSIS
+
+Retrieves account volumes by datastore. Enter a site identifier and cluster identifier to get the list of volumes that exist in the datastore cluster. Or, enter a site identifier and datastore identifier to get the list of volumes that exist in the datastore. To retrieve all volumes for a specific VPG, enter a VPG identifier only.
+
+## SYNTAX
+
+### VpgIdentifier (Default)
+```
+Get-ZAVolume -vpgIdentifier <String> [<CommonParameters>]
+```
+
+### SiteAndDatastoreIdentifier
+```
+Get-ZAVolume -siteIdentifier <String> -datastoreIdentifier <String> [<CommonParameters>]
+```
+
+### SiteAndClusterIdentifier
+```
+Get-ZAVolume -siteIdentifier <String> -clusterIdentifier <String> [<CommonParameters>]
+```
+
+## DESCRIPTION
+
+Retrieves account volumes by datastore. Enter a site identifier and cluster identifier to get the list of volumes that exist in the datastore cluster. Or, enter a site identifier and datastore identifier to get the list of volumes that exist in the datastore. To retrieve all volumes for a specific VPG, enter a VPG identifier only.
+
+## EXAMPLES
+
+### Example 1
+```powershell
+PS C:\> Get-ZAVolume -vpgIdentifier "2345-6789-0123"
+```
+
+Returns all volume information for all VMs in VPG with Identifier "2345-6789-0123"
+
+### Example 2
+```powershell
+PS C:\> Get-ZAVolume -siteIdentifier "3456-7890-1234" -clusterIdentifier "0123-4567-8901"
+```
+
+Returns all volume information for all volumes in Site with Identifier "3456-7890-1234" on Datastore Cluster with Identifier "0123-4567-8901"
+
+### Example 3
+```powershell
+PS C:\> Get-ZAVolume -siteIdentifier "3456-7890-1234" -datastoreIdentifier "5678-9012-3456"
+```
+
+Returns all volume information for all volumes in Site with Identifier "3456-7890-1234" on Datastore with Identifier "5678-9012-3456"
+
+## PARAMETERS
+
+### -clusterIdentifier
+The cluster identifier.
+If a cluster identifier is not entered, you must enter a datastore identifier.
+
+```yaml
+Type: String
+Parameter Sets: SiteAndClusterIdentifier
+Aliases:
+
+Required: True
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -datastoreIdentifier
+The datastore identifer.
+If a datastore identifier is not entered, you must enter a cluster identifier.
+
+```yaml
+Type: String
+Parameter Sets: SiteAndDatastoreIdentifier
+Aliases:
+
+Required: True
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -siteIdentifier
+The site identifier.
+The site identifier is mandatory if vpgIdentifier is not entered.
+
+```yaml
+Type: String
+Parameter Sets: SiteAndDatastoreIdentifier, SiteAndClusterIdentifier
+Aliases:
+
+Required: True
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -vpgIdentifier
+The vpg identifer.
+
+```yaml
+Type: String
+Parameter Sets: VpgIdentifier
+Aliases:
+
+Required: True
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### CommonParameters
+This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see [about_CommonParameters](http://go.microsoft.com/fwlink/?LinkID=113216).
+
+## INPUTS
+
+### None
+
+## OUTPUTS
+
+### System.Object
+## NOTES
+
+## RELATED LINKS
+
+[Zerto Analytics REST API Endpoint for Volumes](https://docs.api.zerto.com/#/Monitoring/get_v2_monitoring_volumes)