directorytest.rb

IMAGE_DIRECTORY = '/images'

def determine_image_location
  for base_directory in IMAGE_DIRECTORY
    for 2nd_level_directory in base_directory
      if number_of_files_in(2nd_level_directory) < 100
        return 2nd_level_directory.name
      end
    if number_of_files_in(base_directory) < 100
      return base_directory.name
    end
  end

  raise "All directories are full"
end