    # File lib/merb-core/test/run_spec.rb, line 22
    def run_spec(spec, base_dir, run_opts = "-fs")

      $VERBOSE = nil
      err, out = StringIO.new, StringIO.new
      def out.tty?() true end
      options = Spec::Runner::OptionParser.parse(??(#{spec} --color).concat(%W(#{run_opts})), err, out)
      options.filename_pattern = File.expand_path(spec)
      failure = ! Spec::Runner::CommandLine.run(options)
      File.open(base_dir / "results" / "#{File.basename(spec)}_out", "w") do |file|
        file.puts out.string
      end
      File.open(base_dir / "results" / "#{File.basename(spec)}_err", "w") do |file|
        file.puts err.string
      end
      exit!(failure ? -1 : 0)
    end