Add Get-DatastoreProvisioned

Script returns thin provisioned info on datastores. Pester file is a way
to validate that future changes made to the script don't break existing
functionality

Scripts/Get-DatastoreProvisioned.ps1

@@ -0,0 +1,67 @@
+<#
+Script name: Get-DatastoreProvisioned.ps1
+Created on: 2016/07/27
+Author: Brian Bunke, @brianbunke
+Description: Augments Get-Datastore with thin provisioned info
+Note to future contributors: Test changes with Pester file Get-DatastoreProvisioned.Tests.ps1
+
+===Tested Against Environment====
+vSphere Version: 6.0 U1/U2
+PowerCLI Version: PowerCLI 6.3 R1
+PowerShell Version: 5.0
+OS Version: Windows 7/10
+#>
+
+function Get-DatastoreProvisioned {
+<#
+.SYNOPSIS
+Retrieve the total thin provisioned space on each datastore.
+
+.DESCRIPTION
+Intended to reveal provisioned space alongside total/free space, to assist with svMotion decisions.
+-Name should be supplied from the pipeline via Get-Datastore.
+
+.EXAMPLE
+Get-Datastore | Get-DatastoreProvisioned | Format-Table -AutoSize
+View all datastores and view their capacity statistics in the current console.
+
+.EXAMPLE
+Get-Datastore -Name '*ssd' | Get-DatastoreProvisioned | Where-Object -Property ProvisionedPct -ge 100
+For all datastores ending in 'ssd', return the capacity stats of those at least 100% provisioned.
+
+.INPUTS
+[VMware.VimAutomation.ViCore.Impl.V1.DatastoreManagement.VmfsDatastoreImpl]
+Object type supplied by PowerCLI function Get-Datastore
+
+.LINK
+https://github.com/vmware/PowerCLI-Example-Scripts
+
+.LINK
+https://twitter.com/brianbunke
+#>
+    [CmdletBinding()]
+    param (
+        # Specifies the datastore names to check. Tested only with pipeline input (see examples).
+        [Parameter(ValueFromPipeline = $true)]
+        $Name
+    )
+
+    PROCESS {
+        ForEach ($DS in $Name) {
+            # Calculate total provisioned space from the exposed properties
+            $Provisioned = ($DS.ExtensionData.Summary.Capacity -
+                $DS.ExtensionData.Summary.FreeSpace +
+                $DS.ExtensionData.Summary.Uncommitted) / 1GB
+
+            # Return info, wrapping it in the Math.Round method to trim to two decimal places
+            [PSCustomObject]@{
+                Name           = $DS.Name
+                FreeSpaceGB    = [math]::Round($DS.FreeSpaceGB, 2)
+                CapacityGB     = [math]::Round($DS.CapacityGB, 2)
+                ProvisionedGB  = [math]::Round($Provisioned, 2)
+                UsedPct        = [math]::Round((($DS.CapacityGB - $DS.FreeSpaceGB) / $DS.CapacityGB) * 100, 2)
+                ProvisionedPct = [math]::Round(($Provisioned / $DS.CapacityGB) * 100, 2)
+            } #pscustomobject
+        } #foreach
+    } #process
+} #function