gistfile1.rb

module Cucumber
  module Formatters
    class FailedFilesFormatter < ProgressFormatter
      def initialize(step, _1, _2)
        @bad_files = []
        puts "Recording fails in bad_features"
        @bad_files_io = File.open("bad_features", "w")
        super(step)
      end

      def step_failed(step, regexp, args) 
        unless @bad_files.include? [step.file, step.line]
          @bad_files << [step.file, step.line]
          @bad_files_io.print step.file, ":", step.line, " "
          @bad_files_io.flush
        end
        super
      end
    end
  end
end