gistfile1.rb

class Test::Unit::Failure

  @@failure_count = -1

  def single_character_display
    @@failure_count = @@failure_count + 1
    case @@failure_count % 4
    when 0
      'F'
    when 1
      'U'
    when 2
      'C'
    when 3
      'K'
    end
  end
end