script = <<-EOH
  # Initialize variable to empty array
  $LogicalDisks = @()

  # Enumerate all logicaldisks
  # DriveType:
  #  Unknown (0)
  #  No Root Directory (1)
  #  Removable Disk (2)
  #  Local Disk (3)
  #  Network Drive (4)
  #  Compact Disc (5)
  #  RAM Disk (6)
  $LogicalDisks += Get-WmiObject -Class 'win32_logicaldisk' -Filter 'DriveType=3'

  # Filter/Quantify
  ($LogicalDisks.Count -eq 1) -and (($LogicalDisks | Where-Object {$_.DeviceID -ne 'C:'}).Count -eq 0)
EOH

control "single_disk" do
    title 'Single Disk'
    desc '
        This test assures that only a single disk (C:) is available
    '

    describe powershell(script) do
        its('stdout') { should match 'True' }
    end
end