# File lib/timeline_fu/matchers.rb, line 25
      def setups_up_callback?
        callback_chain_name = "after_#{@opts[:on]}_callback_chain"
        callback_chain = @subject.send(callback_chain_name)
        if callback_chain.any? {|chain| chain.method == @method }
          true
        else
          @missing = "does setup after #{@opts[:on]} callback for #{@method}"
          false
        end
      end