module Mutant
  class Reporter
    # Null reporter
    Null = Class.new(self) do
      # Report subject
      #
      # @param [Subject] subject
      #
      # @return [self]
      #
      # @api private
      #
      def subject(*)
        self
      end

      # Report mutation
      #
      # @param [Mutation] mutation
      #
      # @return [self]
      #
      # @api private
      #
      def mutation(*)
        self
      end

      # Report killer
      #
      # @param [Killer] killer
      #
      # @return [self]
      #
      # @api private
      #
      def killer(*)
        self
      end
    end.new.freeze
  end
end