class NullState
  # Simplifies call via super to SimpleDelegator during StateHolder#new
  # Avoid chicken and egg problem by mimicing rather than inheriting from State

  attr_reader :holder
  def initialize(holder:, opts: {})
    @holder = holder
    @holder.__send__(:add_state, self)
  end

  def name
    'NullState'
  end
  alias :to_s :name

  def symbol
    :NullState
  end

  private
    def transition_to(state)
    end

    def enter
    end

    def exit
    end
end