failing_cucumber_specs.rake

namespace :failing_cucumber_specs do
  FAILING_SCENARIOS_FILENAME = 'failing_scenarios.txt'

  task :record do
    # run cucumber and record failing scenarios to the file
    begin
      Rake::Task['knapsack:cucumber'].invoke("-f rerun --out #{FAILING_SCENARIOS_FILENAME}")
    rescue SystemExit => e
      # exit 0, we don't want failed build because of this task
      puts "#{e.class}: #{e.message}"
      exit 0
    end
  end

  task :rerun do
    # we don't need to run cucumber again if all scenarios passed
    unless File.zero?("#{FAILING_SCENARIOS_FILENAME}")
      # run cucumber with failing scenarios only
      exec("bundle exec cucumber @#{FAILING_SCENARIOS_FILENAME}")
    end
  end
end