not_if in powershell resource fails

hanging_on_powershell

[Wed, 09 May 2012 07:38:58 +1200] DEBUG: Processing powershell[Creating service TEST_SERVICE from C:\Path\To\MyService.exe] on mybox
[Wed, 09 May 2012 07:38:58 +1200] INFO: Processing powershell[Creating service TEST_SERVICE from C:\Path\To\MyService.exe] action run (c line /chef/cache/cookbooks/on_windows/libraries/service.rb)
[Wed, 09 May 2012 07:38:58 +1200] DEBUG: sh(powershell Get-Service "TEST_SERVICE") - hangs

library_service.rb

  def create_and_start_service(svc_name,svc_path)
    powershell "Creating service #{svc_name} from #{svc_path}" do
      code "New-Service -name \"#{svc_name}\" -BinaryPathName \"#{svc_path}\""
      not_if "powershell Get-Service \"#{svc_name}\""
    end
    service svc_name do
      action :start
    end
  end

recipe_foo.rb

create_and_start_service("TEST_SERVICE","C:\Path\To\MyService.exe")