Validate $Path Parameter Exists & Is Folder - Issue with Spaces

Question

I am trying to validate a PowerShell script path parameter. I want to check that it exists and that it is a folder. Here's my parameter setup/validation script:

Param (
  [Parameter(Mandatory=$true)]
  [ValidateScript({
    if( -Not ($_ | Test-Path) ){ throw 'Folder does not exist.' }
    if( -Not ($_ | Test-Path -PathType Container) ){ throw 'The Path parameter must be a folder. File paths are not allowed.' }
    return $true
  })]
  [String]$Path
)

Usage: .\script.ps1 -Path "C:\Test Path With Space"

When running this on a path that contains a space, it fails validation with: Folder does not exist.

• What am I doing wrong?
• Is there a better way to approach getting a valid folder path?

Note: I chose to use a String parameter instead of System.IO.FileInfo so that I could ensure there was a trailing \ in the path.