(maint) - add bundle install function

src/Puppet.Dsc/functions/New-PuppetDscModule.ps1

@@ -169,7 +169,8 @@ Function New-PuppetDscModule {
         # Generate REFERENCE.md file for the Puppet module from the auto-generated types for each DSC resource
         Write-PSFMessage -Message 'Writing the reference documentation for the Puppet module'
         Set-PSModulePath -Path $InitialPsModulePath
-        Add-PuppetReferenceDocumentation -PuppetModuleFolderPath $PuppetModuleRootFolderDirectory -verbose
+        Install-Gems -Path $InitialPsModulePath -Verbose
+        Add-PuppetReferenceDocumentation -PuppetModuleFolderPath $PuppetModuleRootFolderDirectory -Verbose
 
         If ($PassThru) {
           # Return the folder containing the puppetized module

src/Puppet.Dsc/internal/functions/Install-Gems.ps1

@@ -0,0 +1,31 @@
+function Install-Gems {
+  <#
+      .SYNOPSIS
+        Install required gems
+      .DESCRIPTION
+        Installs required gems as specified in the Gemfile.
+      .PARAMETER PuppetModuleFolderPath
+        The path, relative or literal, to the Puppet module's root folder.
+    #>
+  [CmdletBinding()]
+  param (
+    [Parameter(Mandatory = $true)]
+    $PuppetModuleFolderPath
+  )
+    # verify required gems installed
+    begin {
+    $PuppetModuleFolderPath = Resolve-Path -Path $PuppetModuleFolderPath -ErrorAction Stop
+    $Command = 'pdk bundle install'
+  }
+  process {
+    Try {
+      $ErrorActionPreference = 'Stop'
+      Invoke-PdkCommand -Path $PuppetModuleFolderPath -Command $Command -SuccessFilterScript {
+        $_ -match 'gems now installed'
+      }
+    } Catch {
+      $PSCmdlet.ThrowTerminatingError($PSItem)
+    }
+  }
+  end {}
+}